What do you mean by that? When I download it from MEGA, I still can't launch it on ITCH.
Once it finishes downloading from MEGA, the file then downloads straight to your computer/laptops downloads file on your PC, you don't need to directly download it from ITCH, files that are directly downloaded from ITCH are always less than 1GB (once over 1GB, it goes to MEGA or other 3rd party sites.)