According to Focusrite’s  website, their Saffire Firewire interfaces aren’t compatible with Win 10 1903 and they recommend not updating beyond 1809 for this line as they won’t be supporting them going forward.     https://support.focusrite.com/hc/en-gb/articles/206849319-Windows-10-Compatibility Just a heads up for those who own the Saffire Firewire line.