I'm not really sure about it, because I'm still on ArtRage 6 and have never worked with Vitae. The folder under AppData/Roaming is the path that is set under AR 6. I'm not sure if it is the path under Vitae too. Could this folder possibly be an artefact from an earlier installation of ArtRage on your computer?

I'm asking because I had a similar problem with Affinity Photo, that I purchased from the Microsoft Store. As I tried to install a plugin, I couldn't find Photo's plugin-folder. That's because apps from the MS Store are installed in a kind of Sandbox, and it is not easy to find it. That's one of the reasons why I almost prevent buying software on the MS Store.