If you do not want a monthly subscription, several powerful, secure alternatives exist:

The main reason amtlib.dll is discussed is due to its use in software cracks. These methods modify the file to disable its license-checking function, allowing the software to run indefinitely without a paid subscription.

Ensure the software is on the latest version via the Adobe Creative Cloud app or by checking for updates in Windows. Acrobat Users Security and Legal Warning amtlib.dll error - Adobe Community

Not everyone likes Creative Cloud subscriptions. Consider these perpetual license alternatives:

Sometimes, updating the underlying Adobe licensing framework can fix issues. Security Risks: Why You Should Avoid "Cracked" amtlib.dll