Contacting the authors of Morgonstjärnan 4, Kjell Regmer and Mikael
Börjesson shouldn't be that difficult.
https://www.svenskarollspel.nu/wikia/Morgonstj%C3%A4rnan_4
They run Titan Games that you can find on DriveThru:
https://www.drivethrurpg.com/browse/pub/9987/Titan-Games
They have a homepage (not updated in about 4 years):
http://www.drakar.nu/
OK, I've had a go; trots min dåliga svenska.
No sign of contact details on the wiki.
Can't see contact details via DriveThru save the link that you point to of their homepage.
The contact link there I tried but got an error message. So I was going to give up when I noticed that the error message contained an email address for Mikael. I've now tried that and not had a bounce back.
So I'm not holding my breath, but I'll keep you posted.
tc