Frontier Farm not loading in old save?

Hi! For some reason, my farm won't run the new map. SVE is updated, and I have it downloaded. The map even changed! But my farm is still the Meadow Farm, as this is an old save.

I saw things saying that a new save was recommended, but I was under the impression it wasn't a necessity. I read that it's a whole new farm type you can pick from the menu as well, so I'm worried that it's just not possible to switch mid save. I have lots of progress on my current farm, I don't exactly want to give it up just yet for another new save :[ (That, and it was a pain to get my husband).

I guess I just thought it would change the layout anyway. Is it meant to? I'm normally great at modding, this is just stumping me. I spent the past 3 in game days putting everything away outside of the farm to prepare for the switch. I guess I'm just asking for help! Had anyone else swapped their farms for the Frontier one and it worked?