If you customized some files, just rename the files you customized i.e. cms-bootstrap-custom.asp
When you unzip the new zip file into your existing site folder, core files will be overwritten, but not the files you renamed.
If you have not customized your existing version of the CMS Suite v3, then perform a clean install with the latest version.
- The page content is stored in your current database, so do not over-write your current database or the connection file if you have modified it.
- If you are worried about your modified files that have not been renamed, you can create a backup copy of your existing CMSv3 folder and call it i.e. cmsv3-v3.0.14". Once you have a clean/updated version of the software running, you can copy/paste your modified files from your backup.