[Reed]

Did you get your game through steam? If so you can download old stadium there.

If not, you can go to mod section on forum.

I just use current stadiums.
To do that (for Detroit in this example) go to team page, settings, on right side of page put in stadium name “comerica park”, click edit ballpark, click actions on right side, drop down menu click “auto import data from file into this park, pop up-click no.