MS-Office 2010 Professional Plus – Change Product Key error

Some days ago, I had exactly this problem and the only way to fix this problem was uninstalling and reinstalling Office.

To uninstall Office, use FixIt:

Click Fix it.

At the bottom of your screen, click Open.

NOTE: If the file doesn’t open, click Save > Open Folder, then double-click the file (it should start with "O15CTRRemove") to run the Fix it tool.

Is there a way to obtain my product key without downloading Visual Studio 2010 again, from MSDNAA?

The product is tied into the iso. You would have to download the iso in order to get this information. Its unique to your account.

I have it installed and ready, really, but I need my product key so I could activate it. I have one legally, but I want to avoid downloading 2+ GBs and going through re-installation just for obtaining a string < 128 bytes.

You have no other option if you want the product key.

The confirmation letter says that I should reach any serial numbers or activation keys within my account; however, following the link it gives me, I arrive at the Order Details page that only gives me Order Number and Agreement Number, a "start download" button and a text that I have 24 months of access, but without actually giving me the key.

The product key is contained within a file contained in the iso its a silent installation, the best way to solve this, is to simply reinstall Visual Studio.