Unity won't go past blank License screen

So My asset store wasn't loading, and I read up on it and was told to delete all Unity files in /Library and reinstall Unity. I came back to this, it isn't working at all. It won't go past this screen,

I have tried disconnecting my internet, the Manual activation screen popped up, that didn't work either even after following Unity's instructions, and I got a screen saying "failed to reactivate"

Any ideas how to fix this? I have tried deleting every Unity file on my computer (aside from my projects), and it still won't work.

 

You're running an unreleased, unsupported OS. Use a supported OS (such as 10.9). Also, this has been covered many times; please do a search before posting duplicate topics, thanks.

--Eric