To play multiplayer, all players must be running exactly version 0.16.51. You cannot play with friends using the Steam version if they are on the "None" (latest) beta branch.
Official downloads are available directly from the Factorio Archive . Factorio 0.16.51 - Windows- Linux- Mac Free Download
Improved terrain generation with better cliffs and water scaling. Belt Optimizations: To play multiplayer, all players must be running
Factorio 0.16.51: Exploring the Legacy of a Management Masterpiece To play multiplayer
As the stable peak of the 0.16 branch, this version introduced: : High-damage long-range weapons for base defense. New Map Generation
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.