What's the exact error?
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Yeah, VirtualBox performance is really bad, I definitely don't recommend it. Boot Camp will be the best since it's not running on a VM, but even Parallels would probably be better than VirtualBox.
I use a 2015 Macbook Pro.
I've been working on it full-time for pretty close to 2 years now, and it existed as a side project for several years before that.
This is a common problem when updating the game via the in-game updater. I'm not sure what causes it yet. Please try these steps:
1. Restart your computer.
2. Uninstall Cosmoteer. (It will *not* erase your save files.)
3. Re-install Cosmoteer.
The installation program should automatically install .NET for you, but if you're having trouble with that, then you can install it manually with this: https://www.microsoft.com/en-us/download/details.aspx?id=53344