been getting stuck @ Checking for Version when trying to log onto Europe realm this ladder.
here's what i did to fix it.
open C:\Windows\System32\drivers\etc\hosts as administrator with notepad
added 5.42.181.18 europe.battle.net at the buttom and save
other realms:
121.254.164.18 asia.battle.net
121.254.164.18 asia.battle.net
199.108.55.57 useast.battle.net
12.129.236.17 uswest.battle.net
thought i'd share