hi @AnaRitaMoreira @Miguel1900 , and all
Don’t expect a working version until the 5.6.1 production binary is released.
Trying to get a working early version is why 5.5 failed
This has resulted in making a new GitHub forked repository called UnrealEngine25
If you have the ability to see these being part of the Epic Developers group you will see GitHub announce
Luoshuangs-LGPU-5.6-2025 had recent pushes 52 seconds ago
This is the announcement that the new LGPU 5.6 has been started.
If you have authorized access to Epic Source use the link.
jimshalo10/UnrealEngine25: 10th May 2025 Version 5.6 only due to a corrupted repository source for LGPU 5.1 to 5.5 got deleted
If you get error 404 you don’t have authorized access to the source
The starting point is the same as the newly released 5.6 Preview Binary now on Epic Launcher
Here is my additional LGPU 5.6 readme notes
=========================================================
Luoshuangs-GPULightmass-5.6-preview Started 10th May 2025,
based on past work, possibly 6 months of work over 246 patches required, the 5.6 production binary has not been released
and spending the most time on UEFN 5.6 Fortnite island support
About This branch of Unreal Engine 5.6 preview with Luoshuangs GPULightmass
New LEGAL Requirement for 5.4 onward
UE 5.4 introduced a new EULA that will govern this and subsequent releases. Depending on the work you create with Unreal Engine, you might be subject to new or different fees. Please review the EULA here and make sure you understand how these changes apply to you. By downloading or using the UE 5.4 or later, or by otherwise indicating your acceptance of the EULA, you are agreeing to be bound by its terms. If you do not or cannot agree to the terms of the EULA, please do not download or use Unreal Engine 5.4 or later. This include the branch has updated to 5.6 Preview
Please follow the 5.2 documentation on how to set up GPULightmass, even though this describes CPU Lightmass. see https://docs.unrealengine.com/5.2/en-US/gpu-lightmass-global-illumination-in-unreal-engine
You must follow and make the settings work if you intend to use the Nvidia RTX 4000 series for Substrate, previously known as Strada.
The minimum of al least Nvidia RTX4000 drivers versions R525 U3 (528.02) are required
There is NO BINARY because it’s NOT an Epic official version. Users who are Market Creators have asked to go to 5.4 for performance reasons on Nvidia GTX VRAM being better
This version is all the patches and files to build “Luoshuangs GPULightmass”. LGPU Lightmass patches from the commit GPULightmass5-0-0-cherry-pick repository and others have been added
Use of this repository is without warranty and no responsibility for the use and any subsequent problems are accepted This is for research, development, and training quality, not professional quality.
This version will require at least 170GB of Solid State Drive(SSD) NVRAM to build this.
This version has been patched to remove the 48 Gigabytes of debug PDB file not needed for LGPU Lightmass speeding up build times
The SSD takes about 3 hours to build in on a hobby PC. On a hard drive, this may not complete at least 27 hours
Download Visual Studio 2022 Community, if you have not got this size (31GB configured on SSD)
This UE 5.4 version has support for Visual Studio 2022 17.7 Preview 1 onwards Visual Studio 2019 is no longer supported.
Downloading Visual Studio 2022 Community - Visual Studio (microsoft.com)
=====================================================
That means development is underway. Don’t expect a working version until the 5.6.1 production binary. Trying to get a working early version is why 5.5 failed.
This is just to say the source code GitHub Repository UnrealEngine-5 for past versions got corrupted and was deleted by GitHub. Working only on any past versions is impossible.