I can't login nor unlock Windows after trial period expired.

When you use Windows logon module of TruGate, You will encounter the product key dialog box at expiration of trial period.
If you already get the product key, please enter the product key in the dialog box then you can continuously logon.
If you do not have the product key, reboot the OS. This will disable the Windows logon module of TruGate at next booting of OS.