I have noticed that the past few times I have attempted to delete old car setup versions they don't delete. I click the delete, then the agree, but the files are still there.
Have you tried to rename the corresponding files using Windows Explorer?
I had not tried that, I went through the RF2 folders looking for setups, but I didn't find any files for car setups. Can you tell me the file path to them?
The age of a setup may also have something to do with your issue. At least once since the new UI was released, S397 has changed the format of the setups to allow specific car setups. that meant previous versions of a setup were no longer visible. They were still in the folders, just had to edit like 1 line, but that did make some disappear. Perhaps the formatting is preventing the deletions.??? dunno.
On my PC, the path to setups is as follows:
your steam location/steamapps/common/rFactor2/Userdata/player/Settings/track name
You should be able to delete them from there.