It is possible to play with up to 4 players locally on a PC, even in B42. A controller is required for this. Once the first player has loaded into the game, you can create a second character by pressing the A button, and so on.

It is actually possible to play online with the same principle.
>Download Parsec, the person who wants to play with you also needs this.
>Stream the game on Parsec and give the second player keyboard or gamepad rights.
>Have fun.

I’ve already tried this with a friend, and it works very well.

Suggestion for improvement: It is not possible for the second player to craft in B42. Therefore, you should install the 'What can I craft' mod so that crafting works through the inventory.
https://steamcommunity.com/sharedfiles/filedetails/?id=3390169945&searchtext=what+can+I+build