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How to create update files?

How do I create a update file/folder for my project as I have made it but some of my friends already have the project but a older version so I wanted to know how would I give them a “Update” without giving them the whole thing.

If this is the project itself and not the actual packaged game, you will need to transfer over the whole project as there is really no way to tell which files have changed, just know that you do not need to transfer over the ‘Saved’ folder, as that just contains backups and autosave files. If this is for a packaged game, Epic Games just recently released documentation on how to package update/patch files: http://docs.unrealengine.com/latest/INT/Engine/Deployment/Patching/