And it may take a few attempts, but if you persevere you CAN get in to download it. It took about five retries for me - I kept getting "server full - try again later" type messages, but lucked out on the sixth try. 1% down, 99 to go!!! (xx-crosses fingers that nothing hoses the DL up-xx)
If you are having trouble downloading Arma 2 on steam. Go to your steam client. Then go to File->Settings->Download(tab) and select a different server to download from.
ARMA2 & OA's Steam Thread: All Steam Q's/discussions go here [covered by Dwarden]
in ARMA 2 & OA - TROUBLESHOOTING
Posted
If you are having trouble downloading Arma 2 on steam. Go to your steam client. Then go to File->Settings->Download(tab) and select a different server to download from.