I know that only zypper dup from 15.2 to 15.3 is supported, from reading the release notes for: 2.1 Seamless upgrade from openSUSE Leap 15.2 So a zypper dup from Leap 15.1 is not supported. Ok, that's about the online upgrade. What about an offline upgrade, is 15.1 (or earlier) to 15.3 supported? I mean, boot the 15.3 DVD and select "upgrade" of a 15.1 or earlier installation. I need an authoritative answer. I will update the wiki page (offline upgrade) with this information. -- Cheers / Saludos, Carlos E. R. (from 15.2 x86_64 at Telcontar)