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it says no executable found

Itch download application messing up  .exe file, for some reason - it is literally trying to unpack exe file content.
Same thing are done by some bad archievers.
Try to use manual download and 7Zip, and it should be fine.

this is probably a stupid question, but where do i find the manual download?

https://mega.nz/#!fVBwTaLb!4AU5fLg-m6DO_oFeZTHTD2jXzcWjfUJfF5s8XCnu6GU

try this one