UEFN remote validation fails because Build.bat and UnrealBuildTool are missing after reinstall

General Issues and Bug Reporting
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This error has was fixed in 40.00 by a new function to use

ClearRemoteSource
ClearRemoteSource771×452 105 KB

Then Verify

How to verify UEFN and Fortnite installation

Build.bat comes from UE5 standard Engine an the best idea is to remove all UE 5.* SE before installing UEFN