The Windows Vista operating system is no longer supported by Microsoft. This means that it is not safe or secure to use as it will not receive any more security patches from Microsoft. You can read more on Mocrosoft's website here:
The last version of Pirform that will install on Windows Vista is Pirform 2018.1.1200. Future versions will require Windows 7 or later.
Any customers still using Windows Vista should upgrade now to a more recent version of Windows.