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This is something that is more of a permissions issue from what I see.
More Info: Download to a file failed because a temporary filename couldn't be generated.
So it makes sense on what zXeeskaZx stated, as zXeeskaZx resolved this issue by creating a new admin user.
Basically something is preventing the game from creating a temp file for login. This can happen due to permission issues, security programs blocking this, admin rights, etc.
I hope this helps a bit more fine tune what the issue means. Have you tried creating a new admin or running in selective startup to see if it helps?
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Hey Machkhan, that is not the only reason for 14009, please see my post here for more information: https://us.battle.net/d3/en/forum/topic/7393179703
It would be great if you could pass this to the devs so it will finally get fixed.
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