"Data file too short 'addons\air2.pbo'. Expected 285781947 B, got 284426240 B"

["Data file too short 'addons\air2.pbo'. Expected 285781947 B, got 284426240 B"]

Close Steam entirely, then start it again, as administrator. Then launch the games as administrator too.

I ran Steam as administrator, and then tried to launch both Operation Arrowhead and Combined Operations seperately. I still got the same errors.

["Data file too short 'addons\air2.pbo'. Expected 285781947 B, got 284426240 B"]

Check cache integrity.

Alright, that seemed to work for ARMA 2, but it's not working for Operation Arrowhead and Combined Operations.

Even after trying the same method with Operation Arrowhead,

When I try to launch Operation Arrowhead, I get an error message saying, "No entry 'bin\config.bin/CfgInGameUI/MPTable.shadow'.

When I try to launch Combined Operations, I don't even get an error message-- a black Java script box just pops up briefly and then disappears, and the game does not open.

["Data file too short 'addons\air2.pbo'. Expected 285781947 B, got 284426240 B"]

I just installed ARMA 2: Combined Operations from Steam, and when I try to launch ARMA 2, I recieve the error message; "Data file too short 'addons\air2.pbo'. Expected 285781947 B, got 284426240 B".

How do I fix this?