I mean . . . the expansion is for the second edition of the game.
They make an upgrade kit to turn the first edition into the second edition.
If you have turned your first edition into the second edition you can expand it with second edition expansions such as this one.
Ah, you are correct. My mistake. It was a long time ago that I bought these.
For some reason I was thinking that the upgrade kit only made the 1st edition functional with the 2nd edition's 1st expansion, and that potentially a second upgrade kit might be needed to make the first edition functional with the 2nd edition's 2nd expansion.
Thanks to both of you for responding. Now I can go back to continually checking to see when this will actually be released....