Microsoft announced the release of Windows® 10 on July 29, 2015. Upgrading to Windows® 10 introduces many new features, some of which may affect Act!. We highly recommend performing a complete backup of your Act! database prior to upgrading to Windows, though Act! v17.2 and later are compatible and are fully supported. ACT v18 has full support for Windows 10. The following is to assist you if you are running older versions.
Upgrading to Microsoft Windows 10 with Act! pre-installed
How to back up and restore an Act! database
Answer ID 19211
Installing Act! on a machine with Windows 10 pre-installed