Delete the localthumbcache.package file in your main The Sims 4 folder to prevent conflicts with outdated data. 2. Enable in Game Settings Launch The Sims 4 . Go to Game Options > Other .
Move the extracted folder to Documents/Electronic Arts/The Sims 4/Mods/ . Delete the localthumbcache
This is a script mod and cannot be placed more than one subfolder deep (e.g., /Mods/Basemental Drugs/ is fine, but /Mods/Folder/Basemental Drugs/ will not work). /Mods/Basemental Drugs/ is fine
Download the .zip file from the Basemental Patreon or the Basemental Mods site . Extract the contents; you should see a .ts4script file and a .package file. Delete the localthumbcache