Got a working answer from TAC Support:
"
You want to run (as root, or sudo):
pkgutil --forget com.checkpoint.pkg.epc
This is the part where the installer checks if the software is already installed or not.
Finally, you still want to delete any remaining file before reinstalling:
rm /Library/LaunchAgents/com.checkpoint.*
rm /usr/local/lib/libTrAPI.dylib
rm -rf "/Library/Application Support/Checkpoint"
rm /Library/LaunchDaemons/com.checkpoint.*
"
That was mentioned here:
https://community.checkpoint.com/t5/Remote-Access-VPN/Endpoint-Security-VPN-build-986000724-is-alrea...