I found a thread with the same issue.
Seems that @benjamin had to reset something on the server to fix it. I downloaded the program on my desktop first and it works just fine. I tried logging in on my laptop and it gives me this error.
So, which thread was that?
What did I do?
Whoops, I somehow copied a link to a single post from the thread. I updated my post with the corrected link and here it is again: Login failed - Response was invalid - FIXED @benjamin
Thanks for that.
OK. I’ve done the thig i did before (cleared the blessed devices)
Let me know if you can log in now?!
*crosses fingers and toes and hops back to what he was doing before
That worked perfectly. Thank you. 
Brilliant!
We are some kind of genius! 
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