If the packages want to open with Adobe, you probably don't have SimPe installed on your computer. Anyway, you don't need to open the package files to install them, you just need to add them to the Downloads folder. Also, make sure to enable custom content to show up in game.
Here's some instructions on how to add them to your game.
https://sims.fandom.com/wiki/Game_guide:Installing_custom_content
https://www.thesimsresource.com/helpcenter/view-post/post/23073/Installing%20The%20Sims%202%20Downloads/
https://www.youtube.com/watch?v=u9r4ch5m4mc
