download - Bad Windows License Key

I have several Windows 7 Ultimate license keys that I downloaded a while ago from when I had an MSDN subscription. These are legitimate keys and have not been used elsewhere by me.

Today I went to download from Download Windows 7 Disc Images (ISO Files). This page wanted to know my license key before it would initiate a download, and when I put one of my keys the site responded with:

Error

The product key you provided is for a product not currently supported
by this site or may be invalid. Please try again or visit the
Microsoft Support Contact Us page for assistance.

Is this a genuine problem with my license key, or a problem with a license key that is associated with the Ultimate version?

I do have (pre SP1) ISO files of the same vintage as the keys I have, but I wanted to download something more moderne with the latests updates already baked in.

After a bit of searching around I did find in the Windows Download FAQ

My Windows 7 product key won't verify. What's the problem?

The most common issue is the use of a product key for a product not
currently supported by the site such as an Upgrade key, an MSDN key,
product keys for pre-installed media or an Enterprise edition key. For
access to MSDN products or Enterprise edition visit the MSDN Portal or
the Volume Licensing Service Center. Upgrades and pre-installed media
are not currently supported by the tools on the site. If you believe
you have a valid product key and are still receiving an error, please
contact Support.

Thus the problem was the type of key I had, so the best solution for me right now is magicandre's answer

Answer

You can download any Windows 7 ISO from this page without providing any product key. It generates valid download links from Microsoft servers for all Windows versions.

• Select Windows 7 Sp1 (Build 7601) and Windows 7 Ultimate Sp1

• now select the Language you want to download:

• and finally select the architecture (32 or 64Bit):

• now you see a download button on the right side.

Now download the ISO from the link , which is valid for 24 hours.