Follow this so you can access Unreal Engine repositories : https://www.unrealengine.com/en-US/ue-on-github

You need to have git for windows installed.

I also recommend GitHub Desktop to easily manage repos : https://github.com/apps/desktop

Romancing Saga 2 is created on Unreal Engine 4.27.

Here is my version of Unreal engine modified for the game : https://github.com/nathtest/UnrealEngine/tree/4.27-chaos-RomancingSaga2

It contain only small tweak mainly to allow assigment of chunk id greater than 300.

• Git clone https://github.com/nathtest/UnrealEngine.git
• Checkout to branch "4.27-chaos-RomancingSaga2"
• Follow the install steps on the repo readme
• Compile the engine.

Warning : First compile of the engine can take a very long time

• Git clone this repo
• Right click on "Game.uproject", Select "Switch Unreal Engine Version..." and choose your compiled Unreal Engine 4.27
• Right click on "Game.uproject", Select "Generate Visual Studio project files"
• Open the generated "Game.sln" with Visual Studio
• In Vs choose "Developement Editor" in "Solution Configurations"
• Click "Build" -> "Build Game"
• Wait for compile to finish
• Now double click on "Game.uproject" it will open the editor

In "Project Settings" choose the following options :

In "Editor Preferences" choose the following options :

In "File" -> "Package Project" -> "Build Configuration" choose "Shipping"

In "File" -> "Build Target" choose "Game"

To build package : "File" -> "Package Project" -> "Windows (64-bit)" and choose where to save your pack files.

After compile, you can find your packs in ..\ChoosenFolder\WindowsNoEditor\Game\Content\Paks

You can assign what assets goes in a specific patch chunk by right clicking on an asset in the editor -> "Asset Actions" -> "Assign to chunks"