This is using a completely fresh install of Windows 10 and Steam (Not required). I just did a fresh install to make certain that I had a clean slate for creating and documenting these procedures.



OK after installing, we are going to run the game for the first time:


Notice the top banner, yellow box added for emphasize:



This shows that UCP is not installed. Lets look at MODS from the main menu.



OK exit the game, goto the workshop and lets subscribe to the "Unofficial Code Patch Steam Workshop"


After subscribing and waiting for steam to complete the download, you are ready to start the manual install steps.

OK lets browse to the local files, right-click on the "Master of Orion" to get the pop menu to show and navigate to "Browse local files"



This will being up windows explorer.



Lets navigate to the correct path. First we are going to move up to "steamapps", just click on the highlight:


This will take you here:



From here we navigate down "workshop", "content", "298050", and finally "1109736522".

After that is complete we are going to want to right-click on "UnofficialCodePath-Release.zip" and pick "Extract All...", just use default settings on all prompts.



OK we now are in the correct path and have the files extracted.

Just double-click on "javaInstaller.bat"

If you see this error you need to install java:


So please goto the section for installing java and then return here to complete installation.

When java is properly installed you should see this screen:



Type and press enter: 1

Some text will scroll and your should get a screen like this:

OK you should now notice the change in the top banner, indicating that UCP is installed:



From the main menu, navigate to MODS and make certain both of these mods are active, in a clean install they both will be but check to make certain. The order of these two do not matter, just keep them together.

There are many different Java JRE/JDK you can install for this I'm just going to grab Microsoft's Open JDK. So open a browser and lets go to this URL: https://www.microsoft.com/openjdk

Choose download.

I would pick whatever is the latest OpenJDK that is a LTS version. In this case I'm going to pick OpenJDK 17.0.6 LTS. I would also recommend the version that comes in a "msi" package since it has its own installer, This screenshot shows the correct one underlined.


Just download it and then install it. While installing accept all defaults.

OK lets go back to the section for "Installing UCP (Manual Steps)"

OK lets browse to the local files, right-click on the "Master of Orion" to get the pop menu to show and navigate to "Browse local files"



This will being up windows explorer.



Lets navigate to the correct path. First we are going to move up to "steamapps", just click on the highlight:


This will take you here:



From here we navigate down "workshop", "content", "298050", and finally "1109736522".



Just double-click on it to open it in your preferred text viewer application.