FREE and FULL versions
Free version of app usually contains three selected modules. You can find out if the content is interesting to you. A frequent question after installing the full version is: "Where can I find it?" At this point, you have usually two apps installed with almost the same icons. One with a "FREE" sign and the second app with an "HD" sign. The first one with a "FREE" label could be safely deleted. If you already have a full version just go to the "HD" labeled icon, and you can start to explore the complete content.