Hello, this is a quick Step by Step Guide how the Europe Players can fix the bug with "Checking Version" after you hit the Battle.net Button
Open a Text Editor with Admin Right's (like Notepad++)
After this you should open the File located in the Folder C:/Windows/System32/drivers/etc/
hostsIt should look like this Screenshot
Now write the line
5.42.181.18 europe.battle.net
Last Step: Hit the Save Button !
If you use Avira Defense you need to turn it off for the "Save Step"