LEGO has officially announced the retirement of the LEGO Digital Designer program at the end of January 31 2022. It will NOT be available for download officially after that date although existing copies will still be working (without additional support/updates)
It will be replaced by the Bricklink Studio.
Since 2004, LDD has been operating with a love/hate relationship with LEGO fans. Slightly clunky but the only digital building software program available, it has been used by many LEGO fans. Regular functional updates was officially terminated in early 2016 and this announcement certainly brings the sounding of the death knell for it. RIP LDD 1994-2021