Left without “installer.php” site got hacked

Hi,

by own mistake got hacked due to not removing installation files.

All I have left is .zip archive of the site, but I removed the old site from which I was duplicating it.

Is there any possibility how can I restore the site without installer.php file / or somehow make a new one so I can install the site again?

I’m really desperate ?? What can I do to fix this?

The page I need help with: [log in to see the link]