This worked for me.... error 200.....
I struggled for a while, then found this out. In activation window I clicked drop down menu to show all product keys. That is when it popped up login info request window. Even though I was already logged in on browser it still needed my info. I assume like I did, many copied registered product key from "products" tab on their presonus acct. page and tried to enter it that way.. didn't work for me.
After entering email and password associated with Presonus acct. it brought up the product key, I clicked on it. It entered and it read
Hope this helps.