: The amtlib.dll file is associated with Adobe's licensing and activation processes. If you're experiencing issues with this file, it might be related to software activation or validation.
The safest way to get the correct amtlib.dll is to reinstall the entire application.
Acrobat XI Pro reached its End of Life (EOL) in October 2017. It no longer receives security patches. Using a cracked version of obsolete software leaves your system wide open to PDF-based exploits.
: The safest and most reliable way to obtain DLL files is directly from the software's official website or through official updates provided by the software vendor. For Adobe products, the official Adobe website or your Adobe account (from where you can re-download your purchased products) is the best place to start.