SimPE – The Sims 2 Package Editor
The SimPE site does not always work, and I’m unsure of the safety of the links for it, so I will post them here.
Microsoft .NET Framework Version 2.0
Managed Direct X 9c
Main SimPE
This is the normal user-friendly installer
This is the one you have to unzip yourself and put it where you want.
https://sourceforge.net/projects/simpe/ -all versions