Just purchased the upgrade for RW8. Haven’t been using RW since 2016 so I’m outta touch w/ it. The last version of Stacks I had was the upgrade for Stacks 3 in March 2016.
I installed Stacks 3.0.5 then it tells me RW8 isn’t compatible. It then prompts me asking if I’d like to check for updates. I do so and 3.6.1 pops up, I agree to update the add-on and restart. It hits me w/ the same thing again over and over!
I’d recommend looking through your addons folder and making sure:
there is only one copy of Stacks installed
that it’s named “Stacks.rapidweaverplugin”
that other things in this folder look “OK” (no other garbage files or odd plugins)
Also: it’s a good idea to uninstall all plugins you aren’t using. Even if they aren’t being used, they’re still active in the system and can contribute to strange behavior.