The desktop version of our software was disconnected a few years ago when we emailed every registered user explaining its end of life.
Whilst we still support it for any major bugs, we are not adding any more new features or upgrades. Currently Windows 11 (2023) is the last know supported operating system for the desktop vesrion.
In the end of life email steps were included to show how to use our synchronisation/migration tool to move from the desktop version to our online version for those that want to take this path. Since 2019 synchronisation is no longer available and an export/import method is now needed. For more details see this FAQ... https://www.scheduleit.com/faq/10998/transferring-import-export-convert-data-from-the-on-prem-desktop-version-to-an-online-account