The installation system automatically detects any existing installation of Fedora Core. The upgrade process updates the existing system software with new versions, but does not remove any data from users' home directories. The existing partition structure on your hard drives does not change. Your system configuration changes only if a package upgrade demands it. Most package upgrades do not change system configuration, but rather install an additional configuration file for you to examine later.
If your system contains a Fedora Core or Red Hat Linux installation, the following screen appears:
To perform an upgrade of an existing system, choose the appropriate installation from the drop-down list and select Next.
![[Note]](./stylesheet-images/note.png) | Manually Installed Software |
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Software which you have installed manually on your existing Fedora Core or Red Hat Linux system may behave differently after an upgrade. You may need to manually recompile this software after an upgrade to ensure it performs correctly on the updated system. |