Can't deactivate Studio 2015, videos are not helpful, solution finder doesn't work. And now?

My computer crashed yesterday. I tried to deactivate Studio 2015 online and offline which didn't work. On top of that, I can't use solution finder, as I get an error message when I try to open the form, so I can't send a message about the problem. The videos are not helpful. Who can help me?

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