What pack are you talking about? I'm having the same issue as you.
Viewing post in FS22 Taheton County, IA comments
Well I found the link below on the main page. It's not exactly a "pack" as much as it is just links to download the mods yourself, but that's not even a complete list. For a map relying so heavily on mods (not a bad thing) they should have been included with the main ZIP.
https://drmodding.itch.io/taheton-mod-pack