You can generate keys by going on the project’s page, and then go to “Edit Game” -> “Distribute” -> “Download Keys”. From there you can create a download key, which will give you a URL you can share with people, so they can download your project for free.
Keep in mind you can always revoke the key, if you suspect it’s been leaked or otherwise compromised.
If you want to contact me privately, you can do it on Twitter or Discord (TomT#0284), but I’m happy to help regardless :)