Your computer doesn't meet the minimum specifications, so try installing an older version of this video editing software
Site link (scroll down) https://www.blackmagicdesign.com/supp...
I suggest installing the last updated version. For ex, the latest 14 was 14.3.1. By the way, when installing it, you may uncheck "Control Panels" and "Blackmagic RAW Player" and "RAW Speed Test" options, not needed for most users. The Panels refer to physical digital modules used by professionals.