The authors of the large-scale March leak of materials on STALKER 2: Heart of Chernobyl posted a full-fledged 200 GB build of the game, dated May 26, 2023. The leak was the fault of GSC Game World itself, which posted builds for testers through open torrent channels.
Currently, all build archive data is encrypted and requires a decryptor. The authors of the leak promised to provide access to them in the near future. In the meantime, you can find a build in pirate bays and try your hand at launching.
The release of STALKER 2: Heart of Chernobyl is scheduled for 2023. The game will be a temporary exclusive to Xbox Series X|S and PC.