Acquiring a serial key for DFX 12.023 can be straightforward if you follow the official and recommended channels:
: All previous serial keys for DFX are now defunct. The developers do not provide new keys or recovery for old ones, as the legacy versions are "locked" and no longer maintained. Security Risk dfx 12023 serial key new
If you're looking for alternative solutions to access DFX 12.023 or similar software, consider: Acquiring a serial key for DFX 12