I hit an interesting little problem trying to download and use the developer version of MQ V9.1 for windows.
I downloaded the zip file on my Linux box, and extracted it onto my memory stick.
I rebooted into Windows 10, and tried to install MQ from the memory stick. I got various errors including error code 0x80004005, and “corrupt file” when trying to install Explorer.cab. If you unzip it on Windows, and install it from the memory stick, it works!
Strange eh!