Hi Lawrence,
Thank you for posting your query in Microsoft Community.
We understand that you are unable to open the Crossword Fun app after Windows update.
Before going further, we would like to know more about the issue. Please answer the following questions to help you better.
1. Do you get any error message when you are trying to open the app?
2. Does this issue occur only with Crossword Fun app?
Run the apps troubleshooter and check if it helps.
The Modern app troubleshooter can automatically identify and fix some problems with apps and the Store.
Open the following link and run the Apps troubleshooter:
http://windows.microsoft.com/en-us/windows-10/run-the-troubleshooter-for-windows-apps
Post us back with the required information and the status of the issue. We’ll be glad to assist if you need further assistance.
Thank you.