As most people I hate this bloated spyware called steam. It will cause problems to editor users by updating when asked not to. Or just destroy your current game.
You can set Steam not to update a game but when you restart steam or your computer this setting will often revert back to update.
What works is offline mode! Steam will bitch about not being online everytime you reboot your computer but it will stay offline.
Instructions on how to set up offline mode:
https://support.steampowered.com/kb_article.php?ref=3160-AGCB-2555
Using Offline Mode on a PC.
Please follow the instructions below to configure Offline Mode on your PC:
Start Steam online - make sure the Remember my password box on the login window is checked
Verify that all game files are completely updated - you can see the update status for a game under the Library section (when the game shows as 100% - Ready it is ready to be played in Offline Mode)
Launch the game you would like to play offline to verify that there are no further updates to download - shut down the game and return to Steam once you have confirmed that the game can be played
Go to Steam > Settings to ensure the Don't save account credentials on this computer option is not selected
From the main Steam window, go to the Steam menu and select Go Offline
Click Restart in Offline Mode to restart Steam in Offline Mode
The second way to do this is if you have a proper hardware firewall.
Then block all of the following ports:
UDP 4380, 27000 to 27050
You can set Steam not to update a game but when you restart steam or your computer this setting will often revert back to update.
What works is offline mode! Steam will bitch about not being online everytime you reboot your computer but it will stay offline.
Instructions on how to set up offline mode:
https://support.steampowered.com/kb_article.php?ref=3160-AGCB-2555
Using Offline Mode on a PC.
Please follow the instructions below to configure Offline Mode on your PC:
Start Steam online - make sure the Remember my password box on the login window is checked
Verify that all game files are completely updated - you can see the update status for a game under the Library section (when the game shows as 100% - Ready it is ready to be played in Offline Mode)
Launch the game you would like to play offline to verify that there are no further updates to download - shut down the game and return to Steam once you have confirmed that the game can be played
Go to Steam > Settings to ensure the Don't save account credentials on this computer option is not selected
From the main Steam window, go to the Steam menu and select Go Offline
Click Restart in Offline Mode to restart Steam in Offline Mode
The second way to do this is if you have a proper hardware firewall.
Then block all of the following ports:
UDP 4380, 27000 to 27050
