This guide explains how you can install the Basement Drugs for Sims 4. You will need to download the Basement Drugs 6.11.123 version.
Firstly, you have to search SIMS 4 Basemental Drugs on Google.
Click on the first link and search for Download Basemental Drugs 6.11.123. Once you find this button, then click on it.
A zip file will be downloaded to your Downloads folder. Now you need to open your file explorer. Go to Documents->Electronic Arts->The Sims 4->Mods and create a new folder here, name it Basmental Drugs.
You will need to drag the .zip file of Basement Drugs to the Basement Drugs folder you have just created. Extract all the file content in the basement drugs folder and delete the .zip file.
You will need to start the Sims 4 game and click on the three dots at the top right corner of the screen.
From the menu that appears, go to Game Options and then to Others. Enable the Custom Content, Mods, and Script Mods.
Now you will need to restart your game. A list will appear on the restart to check whether the mod has been installed correctly.