The tar command is not available. Please correctly configure it in your "config.inc.php"

[ctgraham]

See also:

Configuración Comando tar

I think you are almost there. I suspect, though, that the file actually has an extension which may be hidden in your file explorer. You can see it by checking “File name extensions” under the “View” menu in Explorer. Try putting that resulting path in quotes, perhaps: tar = "C:\Program Files (x86)\GnuWin32\bin\tar.exe"