Hi, when you download it from Mojo, it is a zipfile with a bigger bundle. You could open it on your computer and see if there is another zipfile in there. You need a file like gwolle-gb-addon-2.0.0.zip with mostly PHP files in there.
By the way, was there a reason that you bought at Mojo?
I am now selling here and in the future I will only put updates here. I only keep the account open at Mojo so people can update to 2.0.0 to be compatible with Gwolle v4.
But if people are still buying there, it might be confusing and I can better take it away there sooner than later.