I have Avisoft Organiser v3.0 on Windows 7. How do I update to the latest version, and is that compatible with Windows 10?
Latest version of Avisoft Organizer is 3.1.9 released on 7 October 2012. There haven't been any updates since.
You can download it using the following link: http://www.avisoft.co.uk/Organizer/Organizer.htm
For Windows 8.1 and newer, it might be needed to install latest version of Net Framework through the following link: https://www.microsoft.com/en-us/download/details.aspx?id=30653