The modern in-game mod portal does not work the same way in 0.16.51.
: Be cautious of third-party sites offering "free downloads" of the full game, as these are often illegitimate and may contain malware. Always use the official Factorio site for secure files. Are you looking to revert a save to this specific version, or are you trying the for the first time? Version 0.16.51 - Factorio Forums
Added the ability to set priorities and filter specific items directly within splitters, simplifying complex production lines. Specific Changes in 0.16.51
: High-resolution textures for terrain, trees, and rocks, along with the introduction of that serve as natural barriers. Logistics Upgrades Splitter Filter
often leads to unofficial sites, but version 0.16.51 holds a specific place in the game's history as the final "stable" bridge before the massive overhauls of the 0.17 era. The Story of Version 0.16.51 Released on June 15, 2018