Lumion needs to validate the license online periodically.
This is the solution for 70% of users. Lumion stores a license file locally. If that file gets corrupted by a Windows update or a crash, Lumion sees "Invalid."
How to wipe the cache (Windows):
Activate.cfg (or similar .cfg license files).%PROGRAMDATA%\Lumion\License\ (if it exists) and delete everything inside.Now, restart Lumion. It will think it is a fresh install and ask you to activate again. Enter your key. The error should be gone.
If none of the above methods resolve the issue, contact Lumion support with the following information:
Conclusion
The Lumion invalid license error can be frustrating, but it can be resolved using one of the methods outlined in this report. By following these steps, users can regain access to their Lumion software and continue creating stunning visualizations.
Recommendations
Troubleshooting Tips
By following this report, users should be able to resolve the Lumion invalid license issue and get back to creating amazing visualizations.
Solving a "Lumion Invalid License" error often stems from communication breakdowns between your software and the licensing server. This issue can occur due to security software blocking connections, incorrect registration in your account, or outdated system configurations. 1. Verify and Register Your License Key
Ensure your license is properly linked to your official account. As of late 2025, Lumion requires all licenses (including older perpetual keys) to be registered to a Lumion Account for seamless authentication.
Check Account Status: Log in to your Lumion Account to see if your key is registered and active.
Re-register if Needed: If the key is missing, click "Register a License Key" and paste the code from your "Getting Started" email, ensuring no extra spaces are included. 2. Configure Antivirus and Firewall Exclusions
Security software often flags the licensing handshake as suspicious, leading to an invalid status.
Add Folder Exclusions: Add the Lumion installation folder (typically C:\Program Files\Lumion [Version]) and the user data folder in Documents\Lumion [Version] to your antivirus exclusion list.
Allow Firewall Access: Ensure Lumion.exe is allowed through the Windows Defender Firewall for both private and public networks.
Whitelist Domains: Your network must allow traffic on Port 80 (HTTP) for domains like product-download-storage.lumion3d.net and downloadmanager.lumion3d.net. 3. Clean the Windows Hosts File
A common "hidden" cause is a modified hosts file that prevents Lumion from reaching its home server. Open Notepad as an Administrator. Navigate to C:\Windows\System32\drivers\etc\hosts. Look for any lines containing the word "lumion".
Delete those lines and save the file (ensure it does not save as hosts.txt). 4. Release "Stuck" License Seats
If you see an "Invalid" error because a seat is incorrectly flagged as "in use," you may need to force a release. Lumionhttps://support.lumion.com How do you register a License Key on your Lumion Account?
The "Invalid license" error in Lumion usually happens because the software cannot verify your credentials with its activation servers. Direct Fixes lumion invalid license fix
Check Your Internet Connection: Ensure you are online. Lumion requires an active internet connection to verify your license every time it starts.
Disable VPNs or Proxies: These often interfere with the connection to Lumion’s license server. Turn them off and try launching the software again.
Verify Your License Key: Log in to your Lumion Account to ensure your subscription is active and that you haven't exceeded the number of permitted seats for your license type.
Whitelist Lumion in Firewall/Antivirus: Your security software might be blocking Lumion.exe. Add it to your "Exclusions" or "Allowed Apps" list in both your Antivirus and Windows Defender Firewall.
Check the 'Hosts' File: If you previously used a trial or different version, your Windows hosts file might be blocking Lumion's servers. Go to C:\Windows\System32\drivers\etc. Open the hosts file with Notepad (as Administrator). Delete any lines containing "lumion" or "act-3d". Save and restart. Advanced Steps
Update Lumion: Ensure you are running the latest version. License server protocols are sometimes updated, making older versions incompatible.
Release the License: If you left Lumion running on another computer, it might still be "holding" the license. Close Lumion on all other devices.
If none of these steps work, you should contact Lumion Support directly through their official website, as it may be a specific issue with your activation code that only they can reset.
Here’s a step-by-step guide to resolving a “Lumion invalid license” error.
Note: This guide assumes you own a valid Lumion license. If you’re using an unauthorized version, these steps won’t work — you’ll need to purchase a legitimate license from Lumion.
Lumion stores your license info locally. Deleting this forces the software to re-download a fresh token.
The Lumion invalid license error is frustrating, but it is almost always a simple communication error between your PC and the licensing server. Don't let it ruin your deadline. Start with the license.db deletion, check your firewall, and you will likely be rendering again in minutes.
Have you encountered a different Lumion error? Let us know in the comments below!
How to Fix the "Invalid License" Error in Lumion Getting hit with an "Invalid License" or "License Key is Invalid" pop-up in Lumion can bring your architectural visualization workflow to a screeching halt. Whether you’ve just upgraded your software or are moving to a new workstation, this error is usually a communication hiccup between your computer and the Lumion activation servers.
Here is a comprehensive guide on how to troubleshoot and fix Lumion license issues so you can get back to rendering. 1. Check Your Internet Connection & Firewall
Lumion requires a stable internet connection to verify your license key. If your connection is intermittent or a security program is blocking the software, you will see the invalid license error.
Whitelist Lumion: Add Lumion.exe to your Windows Defender Firewall or third-party antivirus (like Norton or McAfee) "Exclusions" list.
Proxy Servers: If you are working in a corporate office, your company might use a proxy or VPN. Ensure that Lumion is allowed to bypass these, as they often interfere with the handshake between your PC and the license server. 2. Verify Your Version and Activation Key
It sounds simple, but version mismatch is a leading cause of errors.
Check the Version: If you are trying to use a Lumion 12 key on Lumion 2023, it won't work. Licenses are version-specific unless you have an active subscription that covers the latest release.
Copy-Paste Carefully: Ensure there are no hidden spaces at the beginning or end of the key when you paste it into the activation field. 3. Clear the "Hosts" File (Crucial Step)
Sometimes, previous installations or network tweaks can add entries to your Windows "hosts" file that block Lumion’s connection to its home server. Open Notepad as an Administrator. Lumion needs to validate the license online periodically
Go to File > Open and navigate to: C:\Windows\System32\drivers\etc.
Change the file type filter to "All Files" and open the file named hosts.
Look for any lines that contain "lumion" or "act-nl-code-delivery.lumiontech.net". Delete those lines, save the file, and restart Lumion. 4. Release the License from Another Machine
Lumion licenses are typically "floating," meaning you can install the software on multiple machines, but you can only run it on one at a time.
If you left Lumion open on your office computer and are trying to open it on your laptop at home, you will receive a license error.
The Fix: Make sure Lumion is fully closed on all other devices. If the software crashed on another machine, the server might still think it's active. Wait about 5–10 minutes for the session to time out automatically. 5. Update Your Network Drivers
Outdated network interface card (NIC) drivers can cause packets to drop during the activation sequence. Go to Device Manager. Expand Network Adapters. Right-click your primary adapter and select Update driver. 6. Reach Out to Lumion Support
If you have tried the steps above and your license is still showing as invalid, it’s possible your key has been blacklisted or there is a backend billing issue with your subscription.
Contact the Help Center: Provide your license key and a screenshot of the error.
Check the Customer Portal: Log into your Lumion Account to verify the status of your seats and see if they are currently marked as "In Use." Preventative Tips
Stay Updated: Always use the latest minor patch for your version (e.g., if you have 12.0, update to 12.5).
Avoid "Cracks": Using unofficial or "cracked" versions of Lumion often triggers permanent hardware IDs blocks, making it impossible to run a legitimate license on that machine later without a full OS wipe.
Are you seeing a specific Error Code number along with the message, or is it just the generic Invalid License pop-up?
The "Your license is invalid" message in Lumion (versions 12.5 and earlier, or 2023 and newer) typically occurs when software on your PC prevents the application from communicating with Lumion's activation servers. Primary Troubleshooting Steps
If you are using a legitimate license key from Lumion or an authorized partner, follow these steps to resolve the error:
Check for Blocking Software: Antivirus or firewall settings are the most common culprits. They may block Lumion from authenticating the license.
Add an exclusion for the Lumion installation folder and executable in your security software.
Ensure your firewall or router allows outgoing connections to product-download-storage.lumion3d.net and downloadmanager.lumion3d.net via port 80.
Verify Admin Rights: Run the Lumion installer or the application itself with administrative privileges by right-clicking the icon and selecting Run as administrator.
Check Internet Connection: Public Wi-Fi or networks with strict blacklisting can prevent the license from being verified. Use a stable, private connection if possible.
Verify Key Accuracy: Ensure there are no extra spaces at the beginning or end of the license key when copying and pasting it from your "Getting Started" email. Version-Specific Considerations Temporarily disable antivirus (just for testing)
Encountering an "Invalid License" message in Lumion often stems from local security software blocking communication with Lumion's servers or a mismatch in how the license is registered
. Below is an informative guide on how to resolve these issues for different versions and user types. Common Fixes for "Invalid License" Messages Security Software Interference
: Often, a valid license is flagged as invalid because antivirus or firewall settings prevent Lumion from authorizing the key online. To fix this, add Lumion.exe
and its installation folder to your antivirus exclusion list. Account Registration (Lumion 12 & Older)
: As part of backend security upgrades, all users of older perpetual licenses are required to link their keys to a Lumion Account
by late 2025. If you haven't done this, your license may appear invalid until registered. Copy/Paste Errors
: For versions older than Lumion 2025, verify the license key was copied exactly from your "Getting Started" email without extra spaces at the beginning or end. Version-Specific Troubleshooting Action to Resolve Lumion 2025+
Log out of the Account Panel and log back in to refresh the license state. Lumion 2023-2024
Verify if a specific Windows update is blocking the HTTP protocol. If recent updates caused the issue, uninstalling the latest KB update might restore connectivity. Older Versions Open Lumion as Administrator, go to Settings > License , and restart to re-enter your Activation Code. Special License Types
Review: Lumion Invalid License Fix - A Lifesaver for Architects and Designers
As an architect, I've relied heavily on Lumion for rendering and visualizing my designs. However, I recently encountered the frustrating "Invalid License" error, which threatened to disrupt my workflow. After searching for a solution, I stumbled upon a fix that resolved the issue, and I'm excited to share my experience with you.
The Problem: The "Invalid License" error in Lumion can occur due to various reasons, including software updates, corrupted license files, or issues with the license server. When I encountered this error, I was on a deadline, and it was essential to resolve the issue quickly.
The Solution: After trying various troubleshooting steps, I found a reliable fix that worked for me. The solution involved a simple yet effective approach:
The Result: After applying the fix, I was able to launch Lumion without any issues. The software recognized my license, and I was able to continue working on my project without any interruptions.
Pros:
Cons:
Conclusion: The Lumion Invalid License Fix worked for me, and I'm grateful to have found a solution that got me back to work quickly. While I understand that using third-party tools can be a concern, I believe that this fix can be a lifesaver for architects and designers who rely on Lumion for their work. If you're experiencing similar issues, I recommend trying this fix, but be sure to backup your data and use caution when using unverified solutions.
Rating: 4.5/5
Recommendation: If you're experiencing the "Invalid License" error in Lumion, try the fix I outlined above. Additionally, ensure that you have a valid license and are using the latest version of the software. If you're still experiencing issues, consider reaching out to Lumion's support team for official assistance.
Applies to: Lumion 8, 9, 10, 11, 12, 2023, and later versions
Issue: Lumion shows “Invalid License,” “License Not Found,” or fails to activate despite having a valid license key.
Try these solutions in order. Start with the quickest fixes first.