You bought the v0,61.1? Or a previous version?
I bought the v0.61.1 two times one time for 5€ and the second time for 10, but i could not download it on the itch.io app, then i tried downloading it from the itch.io website and i did download it but when i tried extracting the Zip file it said that some files cannot be extracted because they were some unsupported file type.