Any updates on this one. As of now the launcher still crashes and I am not a fan of running games with admin rights (not really sure if it will work either, but seem to be a valid option - see references below).
Yet aside from my own believes. Other people mentioned the same issue started occurring within the same timeframe. Just a few, but given number players online and number of players willing to post on forum it looks as a valid sample representing a considerable portion of players (let's say more than 5%... probably more given Win10 is now a 1/3 of all Windows OS installations).
That being said, OBT is around the corner so 1/3 of potential OBT eligible players might be affected. Naturally the fix would come out soon if become critical upon OBT launch, but still 1/3 of players might be given a disadvantage at start not mentioning CBT supporters who will loose their early access opportunity.
I say might, since I don't know what is the root cause and if all Win10 flavors/configs are impacted or just some. But again, given limited number of players online nowadays and hesitation to posting, having 3 post and several people raising the issue means there is some considerable impact.
Other posts about the issue:http://lifeisfeudal.com/forum/launcher-suck-on-80-unpacking-launcher-update-t24720/http://lifeisfeudal.com/forum/launcher-crashing-immediately-cannot-play-mmo-t24729/