For the ProThemes Pack / ProThemes Past Releases (May 2014 to February 2015):

Windows - the installer comes in a .exe format. You just double click on the .exe file and install the slides on the same directory where you installed VideoMakerFX (by default it's C://Program Files/VideoMakerFX).

MAC - Follow the instructions on the PDF guide from this link:

For the ProThemes Monthly Membership (March 2015 onwards):

WINDOWS/MAC - Please follow the instructions on this link: