After activating PDFMarkz, the first time you start the application, you will see a Scripts Installer Window. The Window will list all versions of InDesign from CS6 and higher it finds on your computer that are located in your Applications Folder. Next to each version of InDesign listed is an Install Button. Clicking on the Install Button will install the PDFMarkz scripts into that version of InDesign.
At the lower left of the Scripts Installer Window is a checkbox that lets you hide the Window if there are scripts still available for install on relaunch of PDFMarkz. If you uncheck Launch when scripts available, you can always access this window anytime PDFMarkz is open by going to the Tools Menu and selecting Script Installer.