See if this guide helps initially https://answers.ea.com/t5/Troubleshooting-Guides-Info/Guide-Unspecified-Error/td-p/5881847/jump-to/f...
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I tried and i'm still getting the same message. I followed the launcher repair fix and I still can't get past that point. I want to subscribe but not if I can't even get into the game. Very frustrated.
I have been having a similar issue: no error message, the launcher simply wouldn't patch at all. I'm trying the accepted solution; seems to be working so far, although I did have to repeat the process twice. I'll let y'all know whether it fixes this pernicious issue or not (I've been trying to get it to work since United Forces came out).
December 2017 - last edited December 2017
Update, as promised: It took literally all day (I was a patch behind even when UF released), but the launcher did finally patch. There was that old issue (which was new to me) of the game launching in some freaky resolution, but I found that solution in another thread. Thanks, guys, for all the help