Completed the deployment guide and receiving a device message when deploying the Apple iOS application via QR code or direct link.
"Unable to Download App <App Name> could not be downloaded at this time"
In the first instance please check which certificate type is been used in section 3b of the build process?
The process of deploying via QR code or direct link is called sideloading, sideloading only works if you're using a Enterprise or Developer Certificate.
If you're using an 'App Store' certificate then your application can only be deployed to the Apple App Store and in turn will generate the above message if you attempt to sideload.