Upgrading nginxproxymanager from 2.10.4 to 2.12.6

[darrendavid]

I'm currently running nginxproxymanager 2.10.4 from the scripts and the update command inside the LXC is broken. I've installed a new LXC running 2.12.6, but once I migrate my sqlite database over the application is no longer accessible via the webui, it won't connect. I've checked the NPM releases changelog and don't see anything obvious about this particular upgrade path. Is there a way to upgrade version by version instead? Or perhaps to upgrade my existing LXC? When I run update from within i just get a command not found error, and I'm wary of running the installer script from the Proxmox VM on the same LXC ID as I'm not exactly sure how that process works.