help please

so recently ive been trying to install sequoia on my 2012 macbook pro and i kind of have no idea what im doing. anyways, i installed and i got an error saying an "error occured while preparing installation, try running this application again" and ive seen a lot of other people have this problem and say to go back and reinstall like an older version and work my way up and i have no problem doing that but like how so??? ive managed to get to this page but before it kept restarting on its own and reinstalling. i apologize for not knowing what to do if its like really obvious but im stuck 😭😭😭

Author: @xiaours