It can only be downloaded by mega? I don't have the premium so it will not complete the download.
The APK version
Odd - I wonder if they have different limits per country? Have you downloaded the Mega app? Perhaps that would help. As an alternative, I have more download sites over at f95: https://f95zone.to/threads/spacecorps-xxx-v0-2-9-ranlilabz.21862/