Downloading game on Mac Pro

I bought a mac download game off of amazon and as I went to install it and the following message pops up:
The following disk images could not be opened:
Image: CallofDuty4.dmg Reason: Invalid checksum
I was told I should change or edit my permissions but I do not know how to do that. If someone could help that'd be great.

Boot to your Installer DVD (10.4.7 minimum for Mac Pro 1,1) by holding Alt/Option key at Restart.
Ifyou cannot get the DVD in the drive, wait until the display has settled down and the wait-cursor disappears and press the Eject key to open the drawer, then close the drawer and it should resume and eventually show the DVD.
Answer only the "what language" question and DO NOT PROCEED to Install. Wait a quarter minute for the MenuBar to be drawn, and choose Disk Utility off a menu. Select your Macintosh HD Volume and (Repair Disk).

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