hi @Miguel1900 ,
The update is just as hard as the making of 5.3. Probably I should have put my code makers in first thing, but only started late in conversion.
Hand patching is still the best way its just so hard you can only do a few patches a day. The old July 2023 patches are so out date!
Anyway 5.4 is good because new private branch creation is automatically when you add your first patch.
Superb saved so many days work. Deleted my original fork/branch downloaded the newly renamed branch and built it overnight.
UAT has gone replaced by UBR and for the first time you can used the much requested Multi-threaded automatically build which integrates with Visual Studio 2022 17.10.
Here is the quote from the new style 5.3 d Developer Iteration
Multi-Process Cook (Beta)
Multi-Process Cook helps reduce the total time it takes to get a cooked output from a build farm server or on your local workstation by leveraging available CPU cores and memory resources.
Multi-process cook is a beta feature for UE 5.3. Performance gains may vary, depending on the size of the project and how the data is separated. For best results, we recommend you test different CookProcessCount values depending on the project and available hardware specs documentation
UE5 is still the biggest application built on VS2022, at least 10 copies are being built every day and performance of VS2022 is mostly based on UE5 builds.
In 5.4 Visual Studio 2019 is obsolete you will get an error 
VS2019 has left the room!!.
Now and 5.4 preview is built on VS2022. 