How shall users update such "nightly" programmes/games? Shall I uninstall rvgl first and then install it (again)? Will settings be retained or lost?

Yes, that's currently the only way to update nightly apps in Scoop. Your data will be persisted in the persist folder so you shouldn't lose it (if all goes well…). If your data is really important, I recommend making regular backups of it anyway.

That said, the manifest needs to be updated to point to the new URL. I originally made the version identifier nightly because the download hash kept changing without notice.

Thanks for your quick confirmation. Rvgl has no folder under "persist", though. I will make a backup of "everything" rvgl-related to play it safe.

Hello Calinou, I do not understand why it does not work. Currently, the json is this:

{
    "homepage": "https://rvgl.re-volt.io/",
    "description": "Modern reimplementation of the classic RC racing game Re-Volt (full package with extras)",
    "version": "nightly",
    "license": "Freeware",
    "architecture": {
        "64bit": {
            "url": "https://distribute.re-volt.io/releases/rvgl_full_win64_online.zip"
        },
        "32bit": {
            "url": "https://distribute.re-volt.io/releases/rvgl_full_win32_online.zip"
        }
    },
    "shortcuts": [
        [
            "rvgl.exe",
            "RVGL"
        ]
    ]
}

When I go to the link (64bit), it is the correct file (latest, i.e. 20.1230 version, dated 29 Dec 2029). But even after completely uninstalling rvgl via scoop uninstall rvgl (and making sure that there are no "left-over" folders and files) and doing a fresh scoop install rvgl and then scoop update rvgl, it still tells me: rvgl: nightly-20200821 (latest version)
How come that scoop thinks that nightly-20200821 is the latest version? What am I missing?

Thanks for your insights - and my best wishes to you for 2021!

@7wells I don't know why that would happen, sorry.

@Calinou can close, scoop requires --force for nightlies.

@7wells please close