Digitally remastered versions were released for its 40th, 45th, and 50th anniversaries, available in both DVD and Blu-ray (HD) formats.
The specific filename you mentioned ("HD - Altade...") likely refers to a version hosted on an Italian streaming or download site. Over the years, the film has undergone several remastering processes: Tutti_insieme_appassionatamente_1965_HD_-_Altad...
Modern streaming versions on platforms like Disney+ typically offer the film in HD or higher quality. Digitally remastered versions were released for its 40th,