I performed a new install of 18.104.22.168 on Windows in a different location, then successfully upgraded and everything was there! I tried a basic hello world native app and moved it across to xcode on the mac and it worked beautifully. Not sure why this didn't work before, but glad it works now.
I also downloaded the latest mac version from your link above and that also works perfectly.
Thank you so much for your assistance. I will now start learning how to use the software properly and hopefully create some awesome apps.
For best results, use the Firefox browser..