Commented in June 2020: @Corneil sorry for your experience. When Marketplace lists a plugin as being 7.0+ compatible, that refers to 7.0.x, not to 7.x - sorry, I can't change this listing policy.
As we now have Navigation Menus in the product, I didn't update this plugin any more. Please use Navigation Menus, or look at the linked sourcecode. There's a good chance that you'll just need to recompile with the current version's target platform.