Hi, Reason to have an older version of windows 10 (1803 or 1809) is to be able to play forza motorsport 7. There's no cr... for 1903. I can't easily rollback to 18.. because no more windows.old file and after 10 days of upgrade to 1903. Can I dual boot 2 windows 10 versions? Can I install 1803 on an (external) drive, or usb and start from there? Do I need to disconnect my ssd with 1903 for that? Is there an other solution? (Then reinstall everything from zero?) = too much work with so many programs installed on computer and now on 1903. Thanx for any help or reference to a solution.