@ryann Welcome to the Rockstor community.
Re:
It may be your only option in this case due to the newer hardware. Plus twe are now at Release Candidate 6 (4.0.5) so hopefully fairly close to the next stable release:
If you can manage to build your own installer, for the time being at least, then the result will be fully updated to the time of it’s build. Where as our 3.9.1-0 installer is now years old and is very much showing it’s age. Especially on newer hardware, i.e. nvme etc. Plus our last release for the CentOS based variant was 3.9.2-57 (requiring years of updates from 3.9.1-0 to get there), but our ‘Built on openSUSE’ variant is where we are heading and is the future of the project as a whole. Your existing subscription will pin you to 4.0.4 as a place holder for now but come the time we do release the next Stable version in this flavour your 4.0.4 will then be updated accordingly.
Hope that helps. And once you’ve sussed how to do the DIY installer you will then have that in reserve if you ever end up again needing support for newer hardware as the newest upstream openSUSE kernels are also pre-installed in the installer itself, which is most often the failure point in installs on newer hardware. If you do take the Rockstor 4 route which is ‘Built on openSUSE’ only then do ask here on the forum if you have difficulty with the instructions re the DIY installer build process as a number of forum members are now quite familiar with it.