Hi !
I've got the 2017-2-20 version but I get the same error. :(
It's been 2 weeks and I tried everything I could think of (and didn't find any real fix anywhere on the threads) : ran CCleaner a thousand times, manually deleted .dat files, uninstalled, checked firewall.
Nothing seems to work and I still can't login...
Please give news if you find an efficient fix, I'll do if it works for me.
Thanks