the content inside a zip folder should have files ending with
.package (or for sims/houses sims2package - but that´s another type of file)
you have to put the files manually into your downloads folder for them to work. they don´t install themselves.
.sims2pack files you should download
sims2pack cleaninstaller to use instead of the maxis installer. works much better. double-click on the file, and choose install.
for your information - it looks like you´ve not installed inteen correctly at all. teens can makeout on a couch even without inteen.