Then, I went through the usual Steam help for that, nothing worked.(I have had this issue once before so I know the general steps).This means your client is unable to talk to the Dota 2 Community and Matchmaking Server.
It failed, being stuck on Queued, then "An error has occurred while updating Dot A 2.
(Download Corrupt)" if I try to force the Queued to download.
You can disable this by adding "-nod3d9ex" to the Dota 2 launch options in Steam.
This may make full screen play unstable, so it's recommended you play in Windowed mode if you disable Direct3D 9Ex.
I figured to post here and hope for some better luck and ideas. I decided to re-download CS: GO just because my friends were asking me to re-download the game again.