Wallpaper Engine for Plasma 5 (types: video, web & *scene via seperate plugin-lib*)
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1. get Wallpaper Engine (installed on Steam)
2. Subscribe to wallpapers (Steam Workshop)
3. Select >steamlibrary folder< containing 'steamapps' where WE is installed:

Default Steam library path on Linux: ~/.local/share/Steam
Default Steam library path on Steam-Deck: /home/deck/.steam/steam
(>> not found? try 'show hidden files' and / or copy / paste path in file chooser)

* if some wallpapers dont run ('plugin-lib not found'):
4. install extra plugin-lib via QT5-package (deb, arch, steamdeck; precompiled): https://github.com/slynobody/SteamOS-wallpaper-engine-kde-plugin
or
4. compile extra QT5-plugin-lib yourself: https://github.com/catsout/wallpaper-engine-kde-plugin

* if some wallpapers have errors:
5. downgrade Wallpaper-Engine 'to previous' version in steam (app, properties, "beta")

* If a wallpaper crash your Desktop / Plasma
>> Remove WallpaperFilePath line in ~/.config/plasma-org.kde.plasma.desktop-appletsrc and restart KDE to fix.

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Dependecies.
* arch: gstreamer-vaapi gst-plugin-pipewire gst-plugins-bad-libs gst-plugins-good gst-plugins-ugly mpv python-websockets qt5-websockets
* deb: gstreamer1.0-libav, qml-module-qtwebchannel, qml-module-qtwebsockets, libgstreamer-plugins-bad1.0-0, gstreamer1.0-plugins-ugly, gstreamer1.0-plugins-bad, gir1.2-gst-plugins-bad-1.0, python3-websockets, libmpv2
e)