ClockMaker 2.5 will work on the following Operating Systems -
MAC OSX
Version 11 (Big Sur) to current releases.
WINDOWS
Windows 10 (Build 1903 and higher)
Windows Server 2008 & Higher.
With the 2.5 release, ClockMaker is now a 64 bit Windows application.
Please note that Windows XP, Vista, 7, and 8.1 are no longer supported. If it works, any future upgrades may not. Older versions of Windows 10 are no longer supported as well.