First of all, close your audio software application (DAW/Host).
Start Flux:: Center, open the preferences page (click on the small cogwheel button) and set the plugin fomats that are supported by your daw/host. (Install options may look different depending your operation system)
Click 'OK' to go back to the products page, then install Studio Session Plugins and Studio Session Analyzer
Then open the iLok License Manager software, log in, and activate the Studio Session license.