Downgrading / Preventing auto-updates
Only update once all frameworks are stable!
Preventing the game from auto-updating
GOG
In GOG, this is a global setting — you can only disable auto-update for all of your games.
Open the settings and select the entry Game features
in the sidebar, then uncheck the box for Auto-update games
.

Epic
In the EPIC launcher, this is a global setting — you can only disable auto-update for all of your games.
Open the settings menu and scroll down to MANAGE GAMES
, then disable auto-updates.

Steam
Unlike the competition, Steam will not give you any control about auto-updating. For that reason, you need to forbid it from writing to a specific file on disk, without which it will be literally unable to update. Here's how:
Find the
steamapps
folder (:Right-click on Cyberpunk 2077 in your Steam Library and select
Properties
On the side bar, click on
Local Files
Select
Browse
. This will take you to Cyberpunk's install directory, which is inside the folder we want (e.g.C:\Steam\steamapps\common\Cyberpunk 2077
)Navigate two levels up
Find the file
appmanifest_1091500.acf
Set the file to read-only:
Right-click on the file and select Properties
At the bottom of the dialogue, check the Read-only box
Downgrading
GOG
Head to the Cyberpunk game detail page
Find the settings button next to the Play button
Select
Manage Installation
->Configure…
Select the game version

Epic
Sorry, choomba, you're fucked. No downgrading possible.
Steam
Since 2.0, Steam supports downgrading to version 1.63_hotfix.1
.
Right-click on the game in Steam and select Properties, then go here:

For downgrading to other versions, see the expandable box below.
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