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You can download a trial copy of Windows Server Edition 2012 for free and use that, you don't need to buy a copy. Valid for 180 days: https://www.microsoft.com/en-us/evalcenter/evaluate-windows-server-2012 No, you can spin up as many servers with the same image as you like.

Yeah that's a great article because I doubt most people know about it but unfortunately the free tier runs like treacle. If you running a few bots with the built in scheduler where you're having to leave the bots open then it becomes unusable pretty fast. You might want to take a look at Vultr. You can spin up an instance for $5 a month which is more substantial then the AWS free tier but still very cheap. The only thing you'll need to do is upload your own copy of Windows as an ISO file but this is what I do, they have a guide on how to do it on their own site: https://www.vultr.com/docs/