Extract it to a dedicated folder on your desktop first.
Happy Simming, and may your stream snaccs never spoil.
The last numbered Stuff Pack was My First Pet Stuff (SP18) if we go by old numbering. After that, EA switched to "Kits" (smaller, cheaper DLCs) which use a different code (e.g., Kit files are often labeled GP or just by name). Therefore,
Upload the .zip to VirusTotal.com . Because it’s a mod, false positives may occur, but any detection of .exe or .vbs files means you should delete it immediately.