Same effect, without malware
Create reset_studio3t_trial.bat file, open it with notepad++,
Copy/paste this code in the file:
@echo off
ECHO Reset the use date of Studio 3T...
FOR /f "tokens=1,2,* " %%i IN ('reg query "HKEY_CURRENT_USER\Software\JavaSoft\Prefs\3t\mongochef\enterprise" ^| find /V "installation" ^| find /V "HKEY"') DO ECHO yes | reg add "HKEY_CURRENT_USER\Software\JavaSoft\Prefs\3t\mongochef\enterprise" /v %%i /t REG_SZ /d ""
ECHO reset is complete, press any key to exit...
pause>nul
Save the file.
Double click on it to reset trial registry key.
Start Studio3T.
Enjoy.