Little Snitch Final Version problem fixed with Serial number blacklist issue
0) Install Little Snitch, reboot and use the serial provided:
Serial: 33R7LM0U00-715JZ-95RYHBCFTU
1) put the document "com.lsreset.plist" on the desktop
2) Open the Terminal and type, or copy and paste:
sudo cp ~/Desktop/com.lsreset.plist /Library/LaunchDaemons
press enter
prompts for the password, enter it and press enter
3) enter this one:
sudo launchctl load -w /Library/LaunchDaemons/com.lsreset.plist
and press enter
4) done, restart your computer
in this way, little snitch remains in demo mode indefinitely without ever falling every three hours
*the document remained on the desktop can also trashing