I'm trying to download ML, and get the product distribution file error. I have repaired the permissions in Disk Utility, I don't seem to have a applestore cache. I am on a corporate network, so am thinking it might be firewall related. Ideas?

Hello folks
I've tried every option I can to self support, from disk repair to deleting caches (I don't usually use the appstore so don't have one), and I don't have a pckge file either.
I'm on a corporate network that restricts access to iTunes, so suspect it may be related to a firewall issue, although it has been relaxed to let me access the app store.
Any other ideas of what to check myself before I go to tech support, and what do I need to get them to do. They are not really a mac supporting unit, so I need specific instructions.
I'm on a mac pro, upgrading from Snow Leopard, so download is my only option.
Thanks

Read this whole message before doing anything.
Back up all data.
Quit the App Store application if it’s running.
Step 1
Hold down the option key and select
Go ▹ Library
from the Finder menu bar. Delete the following items from the Library folder (some may not exist):
Caches/com.apple.appstore
Leave the Library folder open. Try the App Store again. If it works now, stop here. Close the Library folder.
Step 2
If you still have problems, quit again. Go back to the Finder and move the following item from the open Library folder to the Desktop:
Cookies/com.apple.appstore.plist
Preferences/com.apple.appstore.plist
Test. If the App Store now works, delete the files you moved to the Desktop. Otherwise, quit again. Put back the files you moved, overwriting the newer ones that may have been created in their place, and continue.
Step 3
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Triple-click anywhere in the line below to select it:
test -d $TMPDIR../C/com.apple.appstore && rm -r $_
Drag or copy and paste the selected line — do not type it — into the Terminal window. You should get a new line ending in a dollar sign ("$"). Quit Terminal.
Test. If the issue is still not resolved, post again.

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    Step 1
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    From the menu bar, select
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    Step 2
    Rebuild the Spotlight index. If you try to search now from the magnifying-glass icon in the top right corner of the display, there will be an indication that indexing is in progress.
    Step 3
    Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
    Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a Fusion Drive or a software RAID, you can’t do this. Ask for further instructions.
    Safe mode is much slower to start and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
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