I have just upgraded from Yosemite to Mojave and also updated Total finder to the latest version. It works fine but whenever it launches (usually at boot up) I get the message that total finder is corrupt.
Should I be doing anything about this. I see that it has been a problem in the past and was supposedly fixed.
Please try to uninstall it completely and then install it again from scratch.
Also (in theory) there might be some other (older) copy of TotalFinder which is being launched instead of your latest installed version. Please pay attention to Console.app logs (filtered with “Finder” keyword) and observe paths which are reported there during TotalFinder launch.