Windows 10 is not officially-supported by WYSIWYG and Vivien at this time. Preliminary tests indicate that our applications install, start up and perform basic functions correctly, but they have by no means been fully-tested in this environment. Testing and full validation with this new operating system has commenced, and official support/certification is expected with the next versions, WYSIWYG Release 36 and Vivien 2016, both due towards the end of this year (2015). Should you choose to upgrade in the meantime and happen to encounter any issues, we strongly recommend reporting them to us. Depending on the problem, we may be able to offer workarounds (should any be available), but please understand that we will not be able to address any issues caused by the operating system itself (i.e. if the same does not occur in the currently-supported operating systems) until the next version. IMPORTANT: Please note that in the past, some users experienced issues of not being able to run WYSIWYG or Vivien after upgrading the operating system (for example, from Windows XP to Windows 7, or from Windows 7 to Windows 8/8.1). The solution to such issues is to uninstall the application, (re-download the installer) and then reinstall. We will follow up with any additional information about Windows 10 here, so you may wish to subscribe to this thread.