Hello. I'm having a similar problem and get the "can't connect to the server" error below. I am a new Lr user within the trial Lr/Ps period. I signed up for the trial yesterday. The installation of Lr and Ps went smoothly and I HAVE BEEN able to use Ps but am getting this error when I try to launch Lr. I'm running a new HP business-class laptop with Window10 professional. Additionally, I had subscribed to Lr mobile via Apple's app store which has been working on my mobile device. As part of my troubleshooting, I've signed out of Lr on both of my Apple products. Oh yea, I have been able to sign in to Lr via the web app from my laptop. Thank you in advance!!!