I just updated from v3.5 to v3.6.5 by copying the VARAC.EXE file to the C:\VARAC folder.
I went to the settings page Rig Control and VARA Configurations, did not make any changes, and then clicked SAVE & EXIT. I got the following error pop-up:
Incoming file misconfiguration
VarAC does not have WRITE permission to the ADIF directory C:/VARAC
(The forum is not letting me upload images to the group)