EDIT, SOLVED COMPLETELY: the updater.jar not downloading files: apparently You cant have any ÄÖÜ characters in the path where the file is located. I Made a simple HAVEN dir on desktop, moved the updater there. Now files are downloading, but dir remains empty after it finishes (only updater.jar is present). I have no idea where the files dissapear
EDIT 2: changed java.exe properties to "run as administrator". Now files appeared.
Bat file not working but not needed - haven.jar is working