On the Download page of the official website, it's specified that the applications developed are compatible with the following versions of Windows: Windows Millenium, NT, 2000, XP, Vista, Windows 7 or Windows 8.
However, I recommend downloading the setup package and proceeding with the installation because most of apps that have compatibility with Windows 8, will run normally on Windows 10.
Download page: http://submitsuite.com/download.htm