Installed 64-bit W7 with its UE DVD, but can't use a HPE key or downgradeUE to HPE?

[Ant]

However, I noticed 64-bit W7 DVD's installer was only for UE (Ultimate

I would have thought you could tell for sure by looking at the DVD or
its packaging.

No, I copied the DVD. I didn't pay attention to its original package and
discs.
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