I found that no one else is maintaining a Scoop package for Reloaded II, so I did it myself.
If the package manifest stops auto-updating and I don't notice, please look for an existing issue at https://github.com/BinToss/scoop-bucket/issues?q=is%3Aissue+is%3Aopen+reloaded-ii and give it a 👍. If an Issue doesn't already exist, create a New Issue.

Currently, .NET 9 Desktop Runtime must be installed separately. I spent a few hours trying to get a separate package set up for .NET 9 Desktop Runtime (for all supported architectures) and gave up when I discovered how complicated it is to check if an update is available for .NET runtimes. I would offload checking for new versions to WinGet, but it doesn't support ARM64 packages.
I'm not saying it's impossible to create a Scoop package for .NET 9 Desktop Runtime with autoupdate. It just requires a lot of time for trial-and-error.

Also, note: I've not thoroughly tested if data persists across versions. I hope it does, but I'm still new to creating and maintaining Scoop packages. If the package updates and your mod, plugins, etc. disappear, please let me know via an Issue.

Install

scoop bucket add bintoss https://github.com/bintoss/scoop-bucket
scoop install bintoss/reloaded-ii