2/6/20 This failed to connect to Github out of the box with a 1003 error. I emailed the company and got an autoreply. I never signed up on their site. Proceeded to get a bunch of marketing emails about all sorts of deals. Finally, support contacted me to tell me it's an "authorization error" but by then, I'd tossed Gitkraken into the trash with extreme prejudice. I complained to the tech support person about all the marketing email and that their marketing person was being way to aggressive. I had to explain that I'd never logged in or signed up for ANYTHING but sending them a support email. And that, in my opinion, did not give them permission to SPAM me to death. The support person "passed this feedback onto their team" but I still continue to get SPAM from them, which I'll continue to report to SENDGRID and their content provider.
3/10 tried 6.5.4 and it logged me into Github w/o a problem, so they fixed that. Apparently this app uses a subscription model ($30/year) just to access private repos. No thanks. Tossed it in the trash again.