Please note that Neighbours is a long-running Australian soap opera. While the show is divided into "Seasons" internationally, in Australia, it airs as a continuous, non-stop serial. Consequently, what is marketed as "Season 6" varies by region (usually covering episodes broadcast in 1990–1991), and official BDMV (Blu-ray Disc Movie) releases for this era are extremely rare or non-existent, with most archives relying on DVD sources or broadcast recordings.
A proper, release-group style subject line would be: neighbours season 06 bdmv