I tried to watch a Spanish OS/390 install video, I saw on YouTube. All the comments were in Spanish, so nothing helpful there. It seems OS/390 can be downloaded from archive.org. So I downloaded ISO 1 of 13. I had a funny feeling. And looked more into it, and it seems illegal to run without a license. However I also read you could run it in a non production environment, at least that was this websites interpretation. Probably trying to justify it for their conscience. I have a gut feeling it is illegal. So I didn’t download any more parts.