The infamous appraiserres.dll file contains the logic for:
The script replaces the dynamically downloaded version of appraiserres.dll with a modified or empty version that returns "compatible" for all checks. Because the batch file acts during the update, the new file is swapped before the setup engine executes the hardware scan.
This is a Command Prompt script (batch file) typically associated with the Rufus utility (a popular tool for creating bootable USB drives). Its primary purpose is to allow the installation of Windows 11 on computers that do not meet the strict hardware specifications set by Microsoft, specifically:
In older versions of Windows Setup (21H2 and early 22H2), compatibility checks were partially handled by a file called appraiserres.dll. The script would locate the temporary setup folder (e.g., C:\$WINDOWS.~BT\Sources), take ownership of this DLL, and replace it with a zero-byte or dummy file. Without the appraisal resources, the setup cannot determine if your TPM is missing. skip-tpm-check-on-dynamic-update.cmd
More sophisticated versions temporarily add entries to the hosts file, redirecting Microsoft’s Dynamic Update servers (*.dl.delivery.mp.microsoft.com) to 127.0.0.1. This forces the setup to fall back to local compatibility data, which the script has already patched.
The script bypasses the check during the current installation. The next major feature update (24H2, 25H1, etc.) will re-run compatibility checks. You must run the script again, or the update will fail.
No bypass script is without consequence. Here are the critical risks. The infamous appraiserres
Users who download an ISO directly (not via the MCT) can't easily modify the bootable media for modern UEFI systems. This script offers a post-boot, pre-install bypass that doesn't require rebuilding the ISO.
Do not use the script on production or user devices without explicit approval and mitigations. Prefer hardware upgrades or supported upgrade paths. If needed for testing, apply strict controls, backup, and ensure reversibility.
If you want, I can:
The Skip_TPM_Check_on_Dynamic_Update.cmd is a script created by AveYo to bypass Windows 11 hardware requirements (TPM 2.0, Secure Boot, and CPU) during "Dynamic Updates"—the process where Windows Setup downloads updates while installing or upgrading. 🛠️ How It Works
The script uses a "Set it and forget it" approach by modifying how Windows handles the setup process.
WMI Event Subscription: It registers an event that monitors for the launch of vdsldr.exe (part of Windows Setup) and automatically deletes appraiserres.dll, the file responsible for checking hardware compatibility. The script replaces the dynamically downloaded version of
Registry Injection: It adds specific keys to HKLM\SYSTEM\Setup\MoSetup like AllowUpgradesWithUnsupportedTPMOrCPU to signal Windows that it should ignore these hardware blocks.
Product Server Trick: Newer versions (v7+) use a method that tricks the installer into thinking it is installing a "Server" version of Windows, which bypasses hardware checks but still installs the standard consumer edition. 🚀 How to Use It Windows 11 In Place Upgrade - bypass checks : r/sysadmin