This is a special version of Function Inspector that you should only install, if you somehow got a promotion code.
If you don't, please take a look at:
Function Inspector LITE: https://play.google.com/store/apps/details?id=de.georgwiese.functionInspectorLite
Function Inspector PRO: https://play.google.com/store/apps/details?id=de.georgwiese.functionInspectorPro
If you do have a code, this version will enable you to enter your code once and use the app just like the PRO version of Function Inspector.