I encountered many issues when downloading the UE4.24.1 C++ source code and hope an expert can help. First, it said ‘Failed to create SSL/TLS secure channel,’ and then there was a network timeout. My solution was to change the " BaseUrl=“http://cdn.unrealengine.com/dependencies” in the XML.
Then use IISCrypto to enable TLS 1.2
After fixing the download issue, a new problem has come up. After downloading and running GenerateProjectFiles.bat, it says it can’t find ispc.exe.
I went back to setup.bat to verify the files, and the result was:and the result was: ueprerequisites x64.exe not found in the directory.
I downloaded the runtime, but the same error still occurs. This problem has been bothering me for two days.




