Android application package for Dangbei Desktop, a TV launcher, version 3.2.5, in an 8.93 MB APK. The Chinese name says this build has advertisements removed, auto-update disabled and is a slimmed-down edition. It is intended for Android TV boxes and smart TVs, installed by sideloading from USB or through a file manager with unknown sources allowed. Since it is a modified third-party build rather than an official release, check compatibility with the device Android version and keep the stock launcher available in case it misbehaves.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @tv_software. Enginerys does not host this file.