I’m not seeing anything specifically in your DxDiag that should indicate a problem.
However, I did do a google search for the error your getting and from what I’m seeing this seems to be a network issue and/or a .Net framework issue.
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Can you try right-clicking on the .uproject or Editor’s .exe file and run as Administrator? This cannot be done from the launcher.
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Can you also make sure to disable your Firewall and any anti-virus programs you are current running. I know you mentioned you had done this before, but please try this again with administrator access running.
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If this fails, can you please uninstall any .Net Framework files and re-install the package.