Assuming that your system drive is C: one click setup will install the software to c:\users\public\documents\vride folder. It will also download and install Patterberg demo loop to c:\users\public\documents\vride folder. Since hopefully you will buy more videos it might not be such a great idea to keep videos on a system drive further down the road as the video files are huge. In this case dedicate some other drive with a lot of free space for the purpose of keeping videos (or buy full drive of videos from us). Then tell the software where to look for the videos by clicking video folder select button as shown in picture and navigating to the folder containing videos:
