The package files ? You don't need to open them. Just copy into your mods folder. If they are rar files you need to donload 7zip or winrar.
sorry for the late reply :/
Oh, you have a Mac :P
It seems like your mod folder only has the Resource.cfg-file, no mods.
You need to move all your mods/cc (all files that end with .package) to the Mods-folder. You're not supposed to open them with anything, just move them. (copy and paste)
Here are instructions on how to do it on a Mac: https://bluebellflora.com/itsaprilxds-how-to-install-mods-on-a-mac-guide-the-sim-4/
In the future, write technical questions on the Sims Mac board, for better help: https://answers.ea.com/t5/The-Sims-Mac/bd-p/The-Sims-Mac
Also a bigger chance that the solutions over there will work for you 🙂
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