The additional contents will appear in Premiere Elements as Movie Themes and Title Templates (under the Edit tab) and Disc Menu Templates (under the Disc Menus tab). You will not see more options in the Organizer that I'm aware of.
Do you see more than one option listed under each of these categories? If so, you have the additional content.
Organizer is used to organize assets and PRE interface is used to edit videos. During the edit process you will several items like Titles Templates, Movie Themes and Disc Menu Templates etc which are available to users only after Contents are installed. If only PRE is installed and no content then those contents will not be available.
Welcome to the forum.
Were you expecting to see "sample" AV files to test with?
If so, there are none, as of PrE 7. PrE4 did include samples, with "a day at the aquaruim" footage, but that was discontinued. Now, the only additional Functional Content will be as stated above, Titles, Menu Sets, Themes/Instant Movie, and some Effects. No more sample files.
However, there are many, many sources of all types of AV footage for testing, on the Internet. One can Search for it by camera make and model, or by file type.
Note: one should not mix formats/CODEC's, and one should also choose a New Project Preset that matches the Source Footage 100%. Otherwise, problems will arise.
If you need to find out how things work in PrE, here is a list of RESOURCES.