I am using the source from Unreal Github 4.26. I have a fresh install engine complied with Visual Studios. I register the editor and ran it and made a new project under the engine folder. I try to run the RunUAT.bat but gives me errors and auto exits. I am using Perforce and UGS and my team needs some precompiled binaries since I will be the only one programming some plugins.
Have you checked this doc, it gives an example on how to submit precompiled binaries to P4.