patch_hlp_21

Fix some issues of Update help context of Microsoft Help Viewer v2.x in Visual Studio 2013

How to fix:
error: "Unable to connect to http://services.mtps.microsoft.com/ServiceAPI/VisualStudio12/en-us";
solution by: https://blogs.msdn.microsoft.com/thehelpguy/2012/04/10/installing-content-from-downloaded-help-viewer-2-0-cabs
The issue can be fixed manually.

error: "An error occurred while updating content: File '???.cab' was not signed by Microsoft".
solution by: https://bytepointer.com/articles/vs2017_help_not_signed_by_ms_fix.htm
The issue can be fixed manually in hex editor or by the tool.

read more in "info.txt", "legal.txt"