As the website which the instructions are located has been removed, here they are.
1. Make sure you have uninstalled all older versions of The Sims 2 games, including registry entries, and make sure there is no “EA Games” folder in your Documents folder (if you do then delete it). Also make sure that you disable your antivirus before installing the game.
2. Extract the “The Sims 2 Ultimate Collection” folder to your desktop. If you don’t know how to extract files, see this article:
https://oldgamesdownload.com/wiki/install-games-on-windows/
3. Open the folder called “Game Files” found inside of the extracted folder and double click on the
Setup.exe file. Click on install and wait for the game to finish installing.
4. Go into the Redist folder and install “
dxwebsetup.exe” by double clicking on it and going through the setup.
There will now be a Sims 2 icon on your desktop! Right click it and select run as administrator to run the game (always run the game as an administrator).
Enjoy the game!
To fix common issues, refer to this guide (such as shadow boxes and resolution.)
https://simscommunity.info/2016/04/27/the-sims-2-setting-up-the-resolution-windowed-mode-smooth-edges-sim-shadows/?msclkid=0194bff6c44811ecb72e3976f818a46c 