@lonely-lost-punk Please run searches for the folders of the kits you've purchased that don't show up. Open a File Explorer window, click This PC in the left panel, and enter the folder name for one of the missing kits in the search field in the upper-right corner. This is the full list of DLC, including folder names:
https://sims4.crinrict.com/eng/extras-2/available-packs-dlc/
For example, if you're looking for Seasons, you'd search for EP05 . Wait for the search to finish, then make sure the full file path is showing under each result. If it's not, expand the window sideways as necessary. Take a screenshot using Windows key-shift-S and attach it to a reply here. Then repeat for one or two more packs.
final screen shot
