My bugfix is a patch and not a mod, which means that the patch cannot be applied through the mod system.
Make sure that your Strive has no mods currently active. Copy the contents of the patch (minus the change log) into the "files" folder of your Strive program folder. The OS should prompt you to replace the files and merge the folders. If there is a "backup" folder in the Strive program folder, then delete it so that a new one will be made including the patch when Strive starts.
Afterwards you can try to add other mods, though some may conflict with the patch due to the many changes, including to the mod system.
Edit: small mistake