Error 105's are caused by damaged files, broken permissions, or bad directory structure. I would suggest deleting any files you already downloaded for it and empty the trash, and then perform some basic system maintenance prior to doing another attempt.
Please use the steps below to repair file permission settings on the hard drive.
1. Navigate to /Applications/Utilities/ and open Disk Utility
2. Select the hard drive the game is installed on
3. Select the First Aid option
4. Click on the Repair Disk Permissions button
Repair Directory Procedure:
1. Start from your Mac OS X Install disc: Insert the installation disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu. (In Mac OS X 10.4 or later, you must select your language first.)
Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.
3. Click the First Aid tab.
4. Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.
5. Select your Mac OS X volume.
6. Click Repair. Disk Utility checks and repairs the disk.
**Always start up your computer from an Install or Restore disc when using Disk Utility to verify or repair your startup volume. Otherwise, you might see some disk error messages.**
Also, check to make sure that you have a Shared folder in Mac HD/Users/. If you don't go ahead and create one.
One more thing, if you are wireless, try doing a direct connection to the modem and starting it again.
Sorry for the wall o' text but these are generally what fixes error 105's.
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