So i checked on the itch support page and it doesnt look like you can differentiate 32 bit from 64 bit builds
>Limits: there is no way to tag channels with architecture (32-bit vs 64-bit) yet.
So i tried to upload the 32 bit version, and it looks like it has overwritten the 64 bit build.
That shouldn't be a problem (in theory) lets hope it didnt break anything, but you should be able to download and run it now.