I was able to do my 5 kills and good riddance, this was awful and don't want to kill another gigantix ever again.
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I've the same problem, boss doesn't appear for me.
I had this problem, to delete all the files you have first to set onwership of the folders to "Everyone", after that then give "Everyone" total control of the folders, that should let you delete them.
So, I did all the workarounds to be able to install and play the game and it worked for two days. I was on my personal quarters when suddenly the text of the menus wasn't showing up, I decide to exit the game to see if that fixed it. The game doesn't launch, no matter how I try to start it, nothing happens. I can't even uninstall it, is the same thing, I click uninstall and nothing happens.
I'm now trying to manually delete all the files to get back my disk space and I'll just forget about this game until they sort this out.