Note: Autodesk rotates tokens. If the direct link is dead, you must use the official manage.autodesk.com method.
. Under "All Products and Services," look for 3ds Max and check the version drop-down menu. Use Autodesk Assistant : If 2020 is not visible, use the Autodesk Assistant chat bubble on the support page. Ask, "Can you help me get a download for 3ds Max 2020?" Education Access download 3ds max 2020 free trial version autodesk link
Autodesk retires older software versions after a few years. 3ds Max 2020 reached its end of life, meaning no new downloads, updates, or technical support. Note: Autodesk rotates tokens
EN 
EL