If you don't know how to manually move the modpack mods then only option is to uninstall the modpack, then try.
I checked your zips, you have used version folder, for WoWs this folder is not needed, just use res_mods/gui/ etc, no res_mods/version/etc as your path in the zip.
I see, what structure you have inside your zip? Please show it, or attach. Have you tested your mods without the modpack? This is how you should check if your mod work at all.
I dont know, looks normal to me. The top panel may slightly overlap on that ribbons, but it was laways like that. These panels at the top are no longer updated by anyone, and we will have to say goodbye to them at some point because I don't know any other creators who would want to create them from a scratch or keep maintaining.
There is no need for #11c 🙂
The popup with new version is fixed like I said in my earlier post.
See, nothing in red
As you know, you can attach logs, otherwise I cannot check anything related to your crashing. Yet, it sounds like an isoleted issue.