It can be installed only on a clean Debian/Ubuntu image. Not just on Armbian. If you want to install this on top of some already installed software, OMV for example, this will 100% fail. Since you didn't provide any details what and where things went wrong we can't improve installer part (if the problem is there at all), which worked fine for me two weeks ago.
It was hard to build this installer. I did one big part, while the other is 3rd party. It took years that process matured on a moving targets. It is very expensive to maintain all this which means there is almost no way that the same will be done for the uninstalling part. This suite is quite complex and its business support can be obtained here.
It is part of the config because I am using it for my own purposes.