PLAXIS 2D CONNECT Edition V21 and PLAXIS 3D CONNECT Edition V21 can be downloaded via the Bentley Software Downloads pages: https://softwaredownloads.bentley.com/
PLAXIS 2DCONNECT Edition V21
PLAXIS 3DCONNECT Edition V21
PLAXIS Monopile DesignerCONNECT Edition V21
General download and installation directions are available here.If you want to see what's new, read the Release notes
All dongle/hardware lock (HWL) based versions of PLAXIS 2D/3D are treated as "V8i SELECTseries 10" according to Bentley's Support Policy. This means that Bentley will discontinue support for hardware lock based versions of PLAXIS after December 31, 2021. This includes PLAXIS 2D 2019 and older, and PLAXIS 3D 2018 and older.
To see the benefits of the latest versions and how to get the latest version, please see PLAXIS CONNECT Edition: upgrade from Hardware lock to Flexible licensing
Older PLAXIS versions, prior to the CONNECT Edition can be obtained upon request by submitting a Service Request: https://apps.bentley.com/srmanager/ProductSupport