No I'm afraid not.

You had to have purchased it by a certain date. Depending on the date you bought it you got:

1) Fallen Enchantress for free

2) both Fallen Enchantress *and* Fallen Enchantress: Legendary Heroes for free

If I had to guess #2 was all pre-orders and some certain date after original launch.

#1 was probably some time after the time from above extended out a bit longer.

I don't recall what the exact dates were, that was like 8 or 9 years ago, wasn't it?

I think if you bought some un-opened copy of E:WoM in the meantime, you are not entitled to the free games.

Plus, I'd also expect that offer to have expired many years ago!

They did keep updating it after release. And you should be able to go to your Stardock account page and download that most recent (still very old) version. It was brought to a level where it was no longer unplayable. I still wouldn't call it in great shape or a good game. But I did download and play it a bit about a year or two ago.