The PTR (public test realm) is opened only when new content is being tested. It is highly unlikely any existing mods or addons will work in the test environment. It would be pointless to install any mods or addons to that directory, much less default there as the Twitch app currently does. Also, it would be a safe bet that 99% of the people that use your app are trying to install for their live version of the game, be it Retail or Classic. I propose that your app be made able to detect the PTR realm as the file path location includes the name "ptr" and then ignore it, please.