Hi man, I have literally tried for 5 hours, I have ve zipped exactly the way you said.
If i just download the game, i can open it no bother, as soon as the game splits into separate folders, it docent let me open the proj file. I have zipped, unzipped and compressed, but my brain cant take it anymore. My brain is compressed into a ball of frustration.
It must be something my end.
Thanks for trying though!