I'm having the exact same problem, after the servers went down today, the launcher refuses to work. Any fixes?
In the link above, as provided bu Unkoala, it says the patchserver has been down for some 110 minutes. That could very well be the reason all of us has this issue right now, and if that is the case we would have no other option at all but so sit and wait untill the issue is resolved.
Personally I will sit back, read some news and have a coffe while waiting to see if the server comes up.
I agree with the post above. Their maintenance schedule is from 14H00 to 18H00 UTC. So if you are in the UK it will be most likely between 15H00 to 19H00 (UTC +1). So myself I will try to go back on STO after 19H00.