I was having trouble with PTT not working with a previous release of VarAC, so deleted all files and resolved to start over later. I downloaded the latest version today, and downloaded the latest cat control file as well, installed them in a new VARAC folder in C:\.
My rig is an FT-991A, and it works perfectly with VARA, VARA FM, and VARA Chat.
I have the settings for VarAC as shown in the accompanying photo. But i get error messages saying "? I'm having trouble with CAT", and when I try to test PTT, with the settings set for CAT PTT, or with the settings set for RTS PTT, there is no PTT.