How To Update UI3

Best way to update the UI3 to a new feature version or a new Unreal Engine version.

General advice: Do not fix what is not broken! There is usually no need to update if you are happy with the project and you are nearing the end of it. An update may revert some of your work or it could introduce a new error. There is always a risk.

UI3 is a Project and not a plugin.

You will need to make a new project each time you update UI3 from FAB. That's how unreal works. There is no way for me to make a partial update within FAB.

The ArchViz User Interface 3 has different versions for the following engine version groups:

• 5.5 to 5.8 and later
• 5.3 and 5.4
• 5.0 to 5.2
• 4.26 and 4.27

The versions within these groups are the same. The version for 5.5 is exactly the same as the one for 5.8 for example. To update from 5.5 to 5.8 you could use the method below.

However - You may want to check if there is a new UI3 version available and create a new project before moving to a new engine version.

Switching to another engine version within a version group is easy and should not cause any problems in the project.

• Close the editor
• Open the Windows Explorer and navigate to your project folder
• Right click the *.uproject file
• Select More Options
• Select Switch Unreal Engine Version
• Change the version if necessary

You may not be able to go back to an older version once you made any changes in the project.

Always create a backup of your project before you update.

You only need to update the following files and folders. These are the files you get from FAB.

• Config - the configuration files
• Content - the project specific content is in this folder
• *.uproject - the main project file

All other folders and files are specific to the PC that you are using. There are also log files, packaging files and other temporary files.

The folders will be recreated when opening the project by executing the main project file.

The files marked are also the ones to share if you want another person to work on the same project. All other files should not be used on a different PC. Let Unreal create them instead.

Read more

Standard Demo Levels

Those levels that come with the UI3 project will be reset.

Custom Project Levels

Any custom levels that were created for the project will not be touched. Actors placed in those levels will stay where they are.

Data Entered into Actors

Settings that have been modified in actors placed in custom levels will not be changed.

Some updates will move settings to a different category or rename them. This should not affect the data set in those variables.

New settings that didn't exist in the previous version will use the default.

Data Tables

Data Tables live in the content browser and not in the scene. Any Data Tables that come with the UI3 project will be reset and all modifications will be lost.

That's why you should make a copy of the Data Table and modify the copy instead of the default one.

Recover Data Tables from backup
All Data Tables are located in ArchVizUI_V3 / UI / Data and could be recovered from there. Just copy them in windows explorer with the editor being closed.
This should only be a last resort! - Sometimes the data structure has been changed so check the data table after the recovery.

Check The Changelist Text File

Open your project folder on your PC. There should be a file called changelist in the main directory.

ArchVizUI3 55 change list.txt or similar

The latest entry at the top will give you the version of the project.

2026-07.1

• 2026 - the year of the release
• -07 - the month of the release
• .1 - this means it is a minor update or bug fix

Version History

Find more information about the version releases on the history page

Version History

Migrate the Content folder from the downloaded UI3 project to your working project's Content folder as usual.

You'll be presented with a list of files that will be migrated. You can untick some files but that may break the update.