I checked everything but still..
Is this for your game Gulch Defense ? I just downloaded without issues. Can you confirm how you found out users can’t download/buy your project?
I don’t know about payments, but your project can definitely be downloaded.
Have you linked a paypal/stripe account to accept payments with? If you provide more details over what error your friends see, it would be easier to find this issue.
If in doubt, you can always contact support, as they have bigger visibility over your account and what needs fixing (if anything).
I could maybe assist with guiding (at least for another player he had all options enabled but not choosen a platform for downloading his game, so it appeared quite broken for viewers). If you'd be open for sending screenshots or something similar, I could maybe help in finding closer info or even getting rid of hat bug/issue?
While I generally don't download games because of my device even loading just a few apps before "lagging" in graphics. Still maybe that way could be an option somehow? I'm on discord, if you'd be open for pm'ing there?