After downloading, double click the 'PennyPerfect Installer' file to start the installation wizard.
Microsoft Defender SmartScreen may give a warning about an unrecognised app. Click the "More Info" link which will show the publisher details, then the [Run anyway] button.
Anti-virus programs may give a warning about running a file from an unknown publisher. There will typically be a link or button with a label such as More Info or Run Anyway to proceed beyond this warning.
The getting started guide will tell you how to enter data and create your first invoice.
Download and install as per the download instructions above.
The installation wizard will detect PennyPerfect is already installed and install in the same directory. Your data files are not overwritten, only the PennyPerfect program is updated with the latest features and pension forms.