See all details here: PLAXIS - Subscription Entitlement Service for PLAXIS 2D CONNECT Edition V20, PLAXIS 3D CONNECT Edition V20 and PLAXIS MoDeTo CONNECT Edition V20.
Legacy PLAXIS products require the CodeMeter dongle with active licenses for the appropriate PLAXIS 2D, PLAXIS 3D and/or PLAXIS MoDeTo in order to run. This includes: