Dota2 Update required but not automatically update - solved

[Gushii]

while playing dota2, I suddenly get out of game and my dota2 in stream show message "dota2 update required". I cannot play it until it completely be updated, but how it doesn't update. I restarted steam 2 times and restart pc 1 time but it still doesn't work.

finally I just go to Libray->Games->(right click on) Dota2 -> Manage download (sometime it show Manage update)

then dota2 start update and everything goes well ... Headach ha!
Do not need to uninstall and reinstall.