FWIW, I can reproduce, but you didn't read the message correctly. It mentions that the user theme extension is not installed.
This is also documented in the elegance-colors instructions, see
You need to visit that site in a browser which supports the gnome-shell plugin system (chrome/chromium doesn't support it, as they dropped support for NPAPI plugins)
so use e.g. firefox and then enable the plugin. Should also be possible to enable the extension by running the following command as your regular user in a terminal:
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gnome-shell-extension-tool -e user-themes
Then you can run
elegance-colors and you shouldn't get that message at the bottom for the missing user theme extension anymore.
You can then also run
elegance-colors-prefs to change the preferences.
Start of it looks like this here:
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[doktor5000@Mageia5]─[22:50:31]─[~] killall elegance-colors
[doktor5000@Mageia5]─[22:50:58]─[~] elegance-colors start
[INFO 22:51:00] Starting process
[WARN 22:51:00] 14686 does not seem to be elegance-colors
[INFO 22:51:00] Updating config file
[INFO 22:51:01] Loading module 'gnome-shell'