Channel 4’s catch up and streaming service is called All 4 and they have a universal app for Windows 8.1 and Windows 10. Channel 4 have just updated the app hopefully fixing sound problems that has been causing issues for many users. The issue which didn’t seem to effect everybody causes the app to have not sound when watching TV which is a bit of a problem!
Channel 4 don’t say what has changed with this release but hopefully the sound problem has been fixed, my test machines are working ok but they were working before the update.
The app is free from the Windows Store.