I have searched on the Janome website, but I couldn't find anything related to Windows 10. If you managed to install and work with the software on Windows 7, then it should work on Windows 10 as well, but you have to do something before installation.
Go to Start > Settings > Update and Recovery > Recovery > Advanced Startup and click on Reset. After it resets, go to Troubleshoot > Startup > Reboot. When it appears, choose option number 7 by pressing the 7 key. While in desktop mode, install the software and accept the warnings when Windows displays a window with the driver. Accept the installation and then reboot the PC. You now have the software and the drivers installed in Windows 10.