TotalFinder 1.12.3 is having problems with Catalina.
Despite deactivating SIP, it will not run at all under 10.15.3
So far it went well, so a tip would be good to make it work again!.
Problem solved:
SIP was disabled with Terminal and Cocktail,
after it was removed in Cocktail and only executed in the terminal in recovery mode it runs very well again!
Restart in Recovery mode. Open Terminal. Run csrutil disable to disable SIP. Install TotalFinder. Reboot. Restart in Recover mode. Open Terminal. Run csrutil enable --without FS --without debug (double β before the the two without statements). Reboot into normal mode. Now you can do updates ot TotalFinder without going through te Recovery/Restart/Recovery routine. When you run csrutil status you should get the following:
System Integrity Protection status: unknown (Custom Configuration).