PerfectIt Cloud is compatible with any computer running Office 2016 or above (Office 365).
PerfectIt 4 is compatible with any version of Windows running Office 2007 and above.
PerfectIt 3 is compatible with all versions of Windows, including Windows XP, 7, 8, 8.1 and 10. PerfectIt 3 is also compatible with all versions of Office, including 32-bit and 64-bit versions of Office 2003, 2007, 2010, 2013, 2016 and 2019.
Development of PerfectIt 2 ended before the release of Windows 10 or Office 2016. It is not compatible with either.
PerfectIt 1 is only compatible with 32-bit versions of Office and has not been tested with Windows 8.