From their website:
Dec. 12, 2017
As of December 12, 2017 iOS and PC/laptop browser versions of the Screenwise meter are no longer supported on the US Reach Panel. Android Mobile Screenwise Meters will work and support for Android 4.3 and above will continue.
Please uninstall any iOS versions of the Screenwise mobile app and any desktop browser meters that you installed while participating in the panel.
iOS and PC/laptop users of the Screenwise browser meter will no longer earn rewards beginning on December 12, 2017.
Android users (version 4.3 and higher), we hope you will continue to use your Screenwise Meter app and keep earning rewards.
I will keep you updated on how this affects weekly earnings and the best way to continue to get the most out of this program.