Thank you for sharing this. If you check the paths in the error warning you see that it is asking you if it should load the gha files from the Rhino 7 folder or the Rhino 8 folder. This happens when you have the plugins installed for both Rhino 7 and Rhino 8. The solution is to install the plugin for Rhino 8 only once so Rhino 8 set the loading path to the Rhino 8 folder, and then you should be fine to install it for both versions. See this post for more information: