When Upgrading from QPM 5.5.1 to 5.5.2. backup both the local.storage and shared.storage files on the QPM server, by default they are located here:
C:\ProgramData\Quest Software\Password Manager
Once they are saved for backup, simply install QPM 5.5.2 right over top of 5.5.1 and all of the settings will be maintained. It is recommended to reboot the server after the upgrade has successfully completed.
Even though the Secure Password Extention (SPE) for 5.5.1 will continue to function with 5.5.2 or 5.5.3, it is recomended the SPE is upgraded to match versions.