Softube Central: What does "Revert" do
This is due to a glitch in the build system. This option is supposed to be reserved for Beta testers. The function is there to make it easier for BETA testers to revert to the customer release from the BETA version.
For now, please don't use the "Revert" button. If you already have it should not cause any problems. Reinstalling the Amp Room Suite, where the plug-in is included, should update the plug-in again to 2.6.19.