Update Failure with Application Deployment - It Wont seem to update to 2.6.0.8 from 2.5.1.4

The update button in the main web interface is a tad bugged, and you also need to update the ampinstmgr Linux package, full guide here:
https://discourse.cubecoders.com/t/how-to-update-amp-to-the-latest-version/2297