I have the same problem! nothing is fixed. 25.10.2017 12:50 UTC - central europe
I bought XP11 in january this year I think, when it was beta, since than I have not been able to install it. First the download servers were down or unstable and I was never able to complete the hughe download. Now I thought I give it another try, and now the authentication DRM server doesnt seem to work.
So I downloaded a pirated copy of XP11 with a crack included, works like a charm. If anyone finds this thread on google like I did, I suggest you try to get a refund with your creditcard company and just go for a pirated version. They do not deserve your money. And I assure you Laminar, I will never buy one of your products again.