Hello paulinus80,
Apple Support Communities is a great place for help with reinstalling macOS, and we’re glad you were directed here from the related article How to repair a Mac disk with Disk Utility.
When attempting to reinstall macOS, are you following the steps outlined in the article below? If not, follow the steps outlined there.
How to reinstall macOS
If you continue to have issues, there’s a section titled Other macOS installation options in that article that may help. Try the steps outlined there, and let us know how that goes.
Have a great day!