I was able to get TotalFinder working perfectly on Tahoe OS 26 (now on Beta 5)
First of all, if it’s working on Sequoia, it will work on Tahoe. It just didn’t work on prior beta versions.
If you are like me and you had to do a fresh install on one of your machines, you can do a great CHEAT to get TotalFinder up and running if you have it running on another Mac.
Of course, you have to disable SIP, disable NVRAM, and run in PERMISSIVE security, allowing kernels to run (both options)
The trick is copying the three .plist files in your User Library and pasting them to the new computer.
I simply went into MAC → USERS → LIBRARY → PREFERENCES and copied all 3 .plist files (com.binaryage.totalfinder) and then pasted it in the same directory on the new computer.
I think it’s a great idea to back up all three .plist files in case you ever need to reinstall on a fresh machine.