ideally you can upgrade on top of the existing version. Make a note of your existing license key. If the previous version needs uninstalled( depend on what source and target versions are) it will be mentioned in the installation instruction/readme for the new version.
One of our production server using 'MSCS' has identified a conflict with EMC powerpath version 5.1, and the resolution for this issue is to upgrade the powerpath version to v5.3. Here are my doubts in order to upgrade the Pp version.    Please help.
EMC Powerpath upgrade concerns.