Learn how to install floors for Sims 1 with this tutorial.

The Tutorial
  1. Step One: Save the File to Your Desktop
    Click on the download link or button and save the file to your  hard drive.
  2. Step Two: Extract File if in Archive Format
    Most custom content will come in archive format (.rar, .zip). If the file you downloaded is archived, extract it. (In Windows, you do this by right clicking and choosing “Extract Here” or “Extract to \”.
  3. Step Three: Locate .FLR File
    If you extract a file, it may have multiple files inside. The only one you should care about is the .FLR file.
  4. Step Three: Navigate to the Program Files\Maxis\The Sims\GameData Folder
    Browse to The Sims folder on your system, then the Game Data folder.
  5. Step Four: Place .FLR File Inside of “Floors” Folder
    You should see a folder marked “Floors.” Drop the .FLR file inside this folder.

Voila! That’s it! The next time you open your game, enter Build Mode, and you should see the floors you just downloaded there.