Yeah, did it every time I tried to re-download it :///
I didn't delete the zipped file after extracting it-- but it made no difference (lol, js thought i'd see if keeping it there do anything)
...and I know my PC is old as hell (Its also laggy, but that's not the problem :/ )
UPDATE:
I recently downloaded another game of Itch, same downloading procedure as yours, and it had done the same thing. I apologise for the inconvenience, it seems your wonderful game isn't the problem :). My apologies!!