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Not so simple if you're using the Steam version; it won't let me download 3.63 because it knows I already did that, even though I subsequently installed the 3.70 Beta-3. URW is the first game I have played via Steam so if there is a way to have dual installations that I have failed to spot, then I would be happy to hear it!
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You are right, Steam will not let you have two version of the same application but luckily for you Steam does not control your computer and you do
You of course can get two legal versions of UnrealWorld on your computer using copy and paste method.
You could try the steps below -- it looks like a novel but it's just 4-5 minute work.
Step 1: (An optional but recommended step) First, back up your savegame directory/directories first.
For example if you are playing a character called 'JohnDoe', and if your Steam is installed (on your presumably Windows PC) at the default path ("C:\Program Files\Steam\"), then you want to:
Step 1a: go to the path "C:\Program Files\Steam\steamapps\common\UnRealWorld\" and right click on the "JohnDoe" directory and click COPY and then
Step 1b: go to somewhere else, for example your Desktop, and right click PASTE.
Step 1c: do the same if you have other characters such as "JaneDoe" etc. in the same directory.
Step 2: Go to Steam application, disable the UnrealWorld beta program, thus take your Steam-UnrealWorld installation back to the current latest-and-greatest-STABLE-(non-beta)-version, which is v.3.63.
Step 3a: Using Windows Explorer, go to the directory which contains UnrealWorld game installation directory.
In this example, that would be at the path "C:\Program Files\Steam\steamapps\common\".
Step 3b: Right click on "UnrealWorld" and click COPY and then
Step 3c: go to somewhere else, for example your Desktop, and right click PASTE.
Now on your desktop you have a UnrealWorld v.3.63 installation.
To be crystal clear this is a duplicate copy and it is forever disconnected from the one that resides in your Steam directory.
If UnrealWorld v.4 is released and you update to it via Steam, the one on your desktop will stay as 3.63.
If you uninstall UnrealWorld via Steam (of course no actual human would ever do that but for the sake of argument let's say insanity took over and you didn't love this game any more
) Steam copy will go away but the Desktop one will stay, unless you manually delete it from your Desktop.
4. Go back to Steam application, choose to activate the beta program once again thus taking your Steam-managed UnrealWorld version back to 3.70beta3 level.
To be crystal clear once more, this step-4 action will update "C:\Program Files\Steam\steamapps\common\UnRealWorld\" but it will not touch the Desktop one.
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At this point in time, you should have two things:
1) Inside your Steam-managed UnrealWorld directory, version 3.70beta3. To be clear, it is here -> "C:\Program Files\Steam\steamapps\common\UnRealWorld\"
2) Inside your Desktop UnrealWorld directory, version 3.63. To be clear, it is here -> "C:\Users\<yourWindowsUsername>\Desktop\UnRealWorld\"
With this setup, you can go to v.3.63, create a new character, it will create a new savegame directory for the character, such as:
"C:\Users\<yourWindowsUsername>\Desktop\UnRealWorld\<newCharacterName>"
You modify it with the tool provided by Night in this thread.
You then copy & paste the now-modified version, from: "C:\Users\<yourWindowsUsername>\Desktop\UnRealWorld\<newCharacterName>" into the Steam location, here: "C:\Program Files\Steam\steamapps\common\UnRealWorld\".
If you do try this and all works, enjoy (it should work by the way). Should you experience issues, post here and we will try and help further...