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What in god's name did I just read?
Yeah, it does install over the base game. Because of that it also makes the base game impossible to play, so what everyone SHOULD do is make a fresh install of the game in a different folder, and install the mod into that. That way you have both original EoC and Unstable Space to play whenever you want.
Ah, yes I do have more than one account, glad to hear you're solving the issue! :3
"It's also worth mentioning that since Team Fortress 2 became Free to Play, Empires is actually free for everyone, with no prior source games required!"
I have Team Fortress 2, and yet I can't play this game, it keeps telling me that hl2.exe in Source SDK 2007 wasn't found, tells me to click OK to start Source SDK 2007 to generate it, then close and restart Empires. This is the fourth time I have done this, and I have also restarted Steam twice, and checked where they were installed, and everything seems to be correct, so I can't figure out what the problem is.