Copy SimpleUnlocker folder to your c4d plugins folder. The X drive is which drive you install your c4d in. for c4d R19, that would be: X:\Program Files\MAXON\Cinema 4D R19\plugins\ for c4d R20, that ...
Each lesson in the playlist has it's own branch in this repository. To see the code for that lesson, choose the appropriate branch. E.g. to see the code for lesson 15, checkout the lesson-15 branch.