hi
you edit the paths in the ini file
and replace the paths
with the editor you need to add it as not steam game and run with proton

[Installation]
globals=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/globals
imgs1=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/imgs1
imgs2=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/imgs2
interf=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/interf
scenarios=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/scens
sounds1=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/sounds1
sounds2=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/sounds2
music=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/music
video=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/video
imgdata=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/imgdata
campaign=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/campaign
exports=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/exports
savegame=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/savegame
briefing=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/briefing
scendata=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/scendata

[InstallationClient]
globals=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/Globals
imgs1=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/imgs1
sounds1=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/sounds1
music=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/music
imgdata=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/imgdata
briefing=/home/A/.steam/debian-installation/steamapps/common/Disciples Sacred Lands Gold/briefing

i thanks this user for some of the info i just add it as a guide edited it and added some context
so i believe its count as original

https://steamhost.cn/steamcommunity_com/app/281450/discussions/0/4515506358401517417/?l=danish

let me know if there is already a guide guys
and god bless you