Android TVBox application package of about 14.7 MB, with a build stamp in the name dated 2 September 2023 plus an identifier string that says nothing more about its contents. The name gives no version number or target device, so treat it as a generic media app for Android set-top boxes. Install it by sideloading via ADB or a USB file manager after enabling unknown sources. As with any APK obtained outside an official store, check it with a malware scanner and keep a backup of the box firmware before experimenting.
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.