Sorry for the late reply. There is no issue with your computer, just bad luck it seems.
It should not happen anymore, now that I banned a few chinese ip ranges that were sometimes causing a ddos outage on one of our two update servers. Also the requests from our Launcher were really still done with the default 5 minute timeout
I guess most other people who had the same issues just aborted the update check and restarted the launcher. It´s a 50% chance to hit the bad/good server if one is unavailable.