It looks like you’re referring to , which is a specific label for a Japanese adult video (JAV) release (commonly associated with the S1 No. 1 Style studio).
For high-resolution media like 4K video files, the "install" usually refers to the download and setup of playback software or the file itself: Digital Purchase/Download ssis541 4k install
: A dedicated 4K UHD and HDR player available on the Microsoft Store . Cinemafly : A premium HEVC & 4K video player for Windows. SSIS-541 It looks like you’re referring to ,