It's not hard to copy the plug-in over but the user shouldn't need to do that (assuming they've not updated their existing Winamp install to be a WACUP install in the same folder)
The problem with simply copying the plugin to the default Plugin folder is that it still doesn't work with WACUP, but with Winamp 5.8, as the hardcoded path only knows "Winamp", not "WACUP", even if the installer asks about the correct path while installing. I just renamed the directory to Winamp, and WACUP worked flawlessly with the old plugin afterwards. By the way, the installer in the legacy desktop scrobbler also renames the plugin in the internal SFX file from gen_wa2_scrobbler.dll to ml_wa2_scrobbler.dll while installing it.
That's why I think it' better to just implement the support directly than rely upon their client solution which as one of the longer term goals is to provide native 64-bit clients means I've got to provide such support where possible otherwise it cripples feature support & that's not ideal.
Either way, I need to move it up the todo list instead of just talking about it
Right, as mentioned on Reddit, there are still quite a lot of Last.fm users who want to scrobble with Winamp, so I tested the currently available versions on Windows 10 version 1903.
I'd missed the edits whilst making my reply. That's interesting to know they dropped support even for the favoured fb2k (I can remember when Winamp was in the initial set of clients supported).
The reason for releasing a new and leaner 3.1.x scrobbler version were the problems with iTunes versions 12.x, as Apple had changed it significantly which broke a lot of external plugins back then.
Having worked a bit on the original standalone plug-in, it's honestly better to just start afresh & have it support the appropriate protocol changes as I'd also have to assume they don't really support them (has been a while since I've looked up what's going on to know for certain what I'd need to look at working with).
Right, the old 1.0 scrobble protocol has been deprecated, and version 2.0 allows authenticating with your Last.fm account without having to fill in your credentials when connecting/logging in. The connected apps are listed in the related Last.fm account settings afterwards:
https://www.last.fm/settings/applicationsThe source code of the legacy scrobbler is available on its GitHub page, e.g. it has just been updated to the macOS Catalina version 2.1.39 which also supports Apple Music instead of iTunes:
https://github.com/lastfm/lastfm-desktop