In a press release they stated:
"We're excited to announce Windows 10 driver software for all interfaces in the Focusrite Red range of Thunderbolt™, Pro Tools™| HD and Dante®interfaces. For the first time, PC users running Windows 10 with the appropriate Thunderbolt3 hardware are able to use Red interfaces — Red 4Pre, Red 8Pre, Red 8Line and Red 16Line — in their audio systems.
Red interfaces are Thunderbolt devices that feature direct connectivity to both Pro Tools | HD and Dante audio environments as standard, without the need for option cards or hardware upgrades. With Red range interfaces, modern audio professionals can work seamlessly cross platform: just switch in real-time via RedNet Control or via the interface's front-panel screens.
Windows 10 Thunderbolt drivers for Red range are available to download now."