If your trial says "Expired" before your 15 or 30 days are actually up, this is likely a licensing glitch rather than a need for a "reset." You can often recover the remaining days using these Autodesk-approved steps :

tells you the trial has ended before your 15 or 30 days are actually up. If this happens, you can often "reset" it back to its original state using this official workaround: The "Already Have a License" Link: Open AutoCAD. On the trial expiration screen, look for the "Already have a license" hyperlink in the lower-right corner. "Enter a Serial Number"

The AutoCAD 30-day trial reset represents a friction point between expensive proprietary software and users seeking extended evaluation. While technically possible through various workarounds, the act of resetting a trial carries significant legal, ethical, and practical consequences. The Technical Landscape of Trial Resets