If you do not see the Reallusion tab in the menu after installation, you can right-click on the menu in 3ds Max and select "Customize." Switch to the "Menus" tab, find "Reallusion" in the list of menus, and drag it to the right window.
Workaround: https://ftp.reallusion.com/reallusionsupport/AutoSetup_for_3dsMax_workaround.zip