@SataiDelennn
There is a lot of good reasons for going for the Ultimate Collection - free of charge and the complete Sims2 package for all aspects of gameplay and loads of content.
Sims2 Expansion and Stuff Packs in disk form can still be purchased on-line e.g. Amazon. It would give you the choice of which one(s) to select and being a disk you don't need to worry about how many times you can re-install if you need to or change your computer from time to time.
The disks are designed to run on Windows XP and Vista but if you have Windows 7 or greater, run in compatibility mode, which I think you are already doing for your Sims2 base game you have installed.
Hope this helps?