I download them from here: https://www.oppetarkiv.se/video/2002390/madicken-avsnitt-1-av-6 (scroll down for the other episodes). The site won't let you watch from outside Sweden, but youtube-dl works fine, if you don't have it you can use http://offliberty.com .

I already downloaded the files from ...

Could someone share the untouched Blu-ray? There's no problem with the custom ISO and I appreciate the effort, but my OCD demands only unadultered media for archival purposes.