OK, on the right hand side you click each object, it will allow you to then download the items.
You will need RAR to do this first.
To install WinRAR, download the file to your computer by clicking on the link on the WinRAR site's download page. You can save it to your hard drive like you did the archive in Step 2. Once it has finished, double-click on the file to run the installer. You should just be able to click next, next, next, etc. to install WinRAR. At the end, click Finish to complete the installation. You will most likely want the top link to the Graphic and Command Line, Trial version.
http://www.rarlabs.com/download.htm
Click the icon to download the object, it will come up with a box asking to save or open. Click "Open" then it RAR will appear, click "extract item", on the right side of the box will appear files, click "my documents" then click "EA Games" then click "sims 2" then click "download" then OK.
In your game you may have to enable custom content. (not sure what sims 2 game you have) if that's not clicked, once you do enable custom content, back out of your game and re-start it.
Let me know if you need more help. My IM and Email are open in my profile.