Adobe provides an official tool to remove all traces of CS5.1 installations. After cleaning, reinstall from your original disk or digital installer.
For a standard 64-bit Windows installation of Adobe Illustrator CS5.1, the genuine amtlib.dll is found at:
C:\Program Files\Adobe\Adobe Illustrator CS5.1\Support Files\Contents\Windows\
(For 32-bit systems, it would be in Program Files (x86)). Adobe Illustrator Cs5.1 Amtlib.dll
The file is digitally signed by Adobe Systems Incorporated. A legitimate file size is typically between 1 MB and 3 MB, depending on the patch level.
Disclaimer: This section is for educational purposes for users who legitimately own a license and need to perform manual replacement during troubleshooting. Replacing this file with a cracked version is piracy. Adobe provides an official tool to remove all traces of CS5
Prerequisites:
Steps:
Verification:
If the file is legitimate, Illustrator will start normally, and the “Help” menu will show “Activated.” If you see a trial expiration warning, the replacement file is either wrong or tampered.