failed to download required installation files [http://dist.blizzard.com.edgesuit.net/sc2-pod/installdata.Master/Win/s2_engb_disk_unencrypted_win.blob] .check your internet connection.
Please do something about it and stop telling people to turn off the fire wall and background programs or delete agent folder or cache folder because it wont work I tried everything you have said already.
Its not us its blizzard problem I have been playing this game since its release and suddenly now my antivirus does't let luncher to update ? I even uninstalled my antivirus and had same error.
Please Just give us real answer even if the answer is you can't do anything about it and we have to stop trying and forget playing SC2 .