Hello,
When I try to navigate to /install/index.php, I get a 404 error.
If you're starting a completely fresh install, I'd suggest zipping everything in your public_html folder into an archive and downloading it to your computer. Then the files can be deleted from public_html and you can start again.
Do not delete the actual public_html or www folders.
Remember to tick the box after clicking cPanel file manager to view dotfiles.
Also, remember to empty the MySQL database before reinstalling.
And
Your domain name is:
http://retrosites.exofire.net
Not .x10.mx.