But nothing helps and always the same problem, for the last year. We removed all GOG NMS installed copies of the game on all computers throug GOG Galaxy (uninstall with remove savegames and settings) and reinstalled.
We tried several things, like removing old savegames and starting anew. Always the same message "No Man's Sky Error - The game has encountered an error and will now shutdown" and then some error code 67249_0xC21893_GX53461397225026857.
NMS MULTIPLAYER UPDATE
Meanwhile, after every NMS update we try again but always have the same situation: someone starts a multiplayer game, someone else tries to join and the game crashed with the second person. I reported the issue several times in june and july 2020 to the suggested url with the error token, but didn't get any answer except a "Thanks for reporting a bug, crash or issue!" When no one else is playing, a multiplayer game can be started without any problem. Since then, whenever someone starts a multiplayer game, the game on the other 2 computers always crashes when starting multiplayer. However at the first launch of the game, the game crashed. A while later we also bought a GOG NMS copy on the account of my youngest kid. So in the first half of 2020 my oldest kid bought and installed the GOG NMS game and we played several fun multiplayer sessions. Always loved NMS and last year, my two kids got really excited about it.