[FIXED] Affinity apps no longer start after installing the Windows 10 October 2020 (20H2) update

[Leigh]

UPDATE: This issue is now resolved in the 1.9.0 update which is now available from the Affinity Store and Microsoft Store.

We've had reports that our apps no longer start after installing the Windows 10 October 2020 (20H2) update. This update is changing the default Device profile in Colour Management to a Virtual profile. If you see the below information in Application Logs in Event Viewer after trying to start our apps  -

Description: The process terminated due to an unhandled exception.
Exception information: System.ArithmeticException

Exception information: System.OverflowException
    at System.Windows.Media.Imaging.ColorConvertedBitmap.FinalizeCreation ()
    at System.Windows.Media.Imaging.BitmapImage.FinalizeCreation ()
    at System.Windows.Media.Imaging.BitmapImage.EndInit ()
    at Serif.Affinity.ResourceManager.GetBitmapSourceCore (System.String)
    at Serif.Affinity.UI.AboutDialog..ctor (Boolean)
    at Serif.Affinity.Application.RunSingleInstance ()
    at Photo.Application.Main (System.String [])

Please go to Colour Management > Advanced > Windows Colour System Defaults and change the Device profile from scRGB virtual device model profile to sRGB IEC61966-2.1

Once changed, the app should run as expected.