Released in early 2018, version 0.16.51 was primarily a bug-fix patch for the massive 0.16.0 update. Here is what made this version special:
Version 0.16.51 is a significant milestone in Factorio’s development history. Released in early 2018, this was the final stable build of the 0.16.x experimental branch—an update that introduced some of the most beloved features in the game before the 1.0 release. Factorio 0.16.51 - Windows- Linux- Mac Free Download
Searching for “Factorio 0.16.51 cracked” will lead to torrents and file-sharing sites. These files are often: Released in early 2018, version 0
Steam allows you to easily "downgrade" your game to previous versions using the "Betas" feature. Released in early 2018