This is a little step-by-step guide on how to set up multiple versions of Dead Cells on Steam so you can easily switch between them without having to manually change versions (and download updates/downpatches) every time you move between versions!

Setting up the versions:

1. Download the correct version you want from a reliable source (e.g., www.speedrun.com).
2. Paste it somewhere (into a separate folder) and preferably rename it so you know which version it's for (e.g., "Dead Cells [v2.4]").
3. Create a new file in the copy & pasted Dead Cells folder and call it "steam_appid.txt". Open it, type in "588650" (this is the Dead Cells Steam Game ID number) and save.

Because of the "steam_appid.txt" file your total playtime on Steam will go up so you don't have to worry about that.

If you want to make a copy of your current Dead Cells version (not the most recent version but the version you are on) yourself, then replace the step 1.1) with these:

1. Go to your Steam Library -> right-click Dead Cells -> Properties -> Local Files -> Browse.
2. Copy the "Dead Cells" folder you are in.
3. Continue with the instructions below.

You can make the other versions appear in your Steam Library:

1. Left-click on "Games" at the top left on Steam and click on "Add Non-Steam Game to My Library..."
2. Click "BROWSE...", select the "deadcells.exe" file from the correct version folder and click on "ADD SELECTED PROGRAMS".
3. Rename the game from "deadcells" to something that lets you know which version it is (e.g., "Dead Cells [v2.4]").

You can disable the cloud save between multiple versions if you feel like it might mess something up:

1. Open Dead Cells (preferably the main version, though I doubt the version matters).
2. Go to "Options", then "Gameplay".
3. Scroll down until you find "Steam options" with the setting "Activate Steam Cloud synchronization." and turn that off.

Enjoy!