Technically, it is correct to say that Proclaim "runs" on Windows 10, but it doesn't seem to have the ability to play any videos (particularly mp4's) any more. My understanding is that it only interfaces with Windows Media Player (WMP) and that is no longer supported on Windows 10. I upgraded one of my computers from Windows 7 to Windows 10 and the WMP is still working - on that computer Proclaim is properly playing mp4 videos. But on others that upgraded from Windows 8 to 10, the WMP was disabled during the installation and Proclaim will not play any videos.
I use Proclaim for children's ministry and we use The Gospel Project curriculum that has great videos. I can't upgrade my computer until I am sure I can use the videos during my lessons.
Any solutions?