Why did you start going through Mega? What's the point in releasing a free game using software that requires you to pay, or wait 6 hours, to finish the download. I tried to sleep and allow the 6 hours to pass, only for the download to completely restart. Personally, I'd recommend abandoning Mega and releasing the game as you did before using such an awful service. It's basically a big screw-over to anyone who wants to continue playing, and simply can't afford a $20 subscription service or spend 6 hours of their day staring at a computer, waiting for a download to finish. Please go about the public release the same way you used to, because Mega is absolute trash that makes it an impossibility to play.
I just don't understand the hatred for MEGA, especially this kind of hatred, since it doesn't cost anyone anything to make the most important parts of this specific complaint disappear; the download restarting instead of resuming, and the need to closely monitor the download.
I use the MEGA Desktop app, and have never had any problems downloading for free. Yes, the transfer limit is there unless you pay, and you need to create an account, but when the waiting period is over, the download resumes where it left off, without any issue and without restarting. And you can queue up several downloads with the desktop app too, and then be ensured they will be downloaded in full.
There are several more features with the desktop app, but suffice it to say that it is the solution to this complaint, for free.