7.75 release is a maintenance and security update of the D7 series. It fixes security vulnerabilities and all sites owners are urged to upgrade immediately!
No changes have been made to the following files: .htaccess, web.config, robots.txt and default settings.php. That means there are no need to update these files from your old versions. But running update.php is required for this update in order to ensure a site cache clear. (There are no changes to database schemata.)
There are several ways to upgrade Drupal core. To learn about each of them please visit how to update Drupal page to choose which one is the right one for your website. Remember, before making any updates or core files work create Drupal's data base backup, or full system back up. If you need any assistance with your Drupal based website, contact Web Admin. We a reliable back up your files and system and update your website to the latest version.