Instructions
Open your Web browser and navigate to ModTheSims.info. Type "Tower Windows" into the search bar, then hit "Enter."
Click on the mod to download the file. Extract the file once the download finishes by right-clicking the icon and selecting "Extract to Desktop."
Open "My Computer" then "My Documents." Double-click the "EA Games" folder, then select "Sims 2."
Open the "Download" folder by right-clicking the file and selecting "Open." Drag the mod from your desktop into the "Download" folder.
Open "The Sims 2" and navigate to Build Mode. Create an octagon shaped building with three straight floor tiles and two diagonal floor tiles.
Click on the "Window" section of build mode. Scroll through the windows until you see "Left Window" and "Right Window." Select the item and place the windows on the correct section of your building.
Click on "Live Mode." The octagon shaped building will now transform into a building with round walls.