Fix The app didn't start in the required time error

This post helps Fix The app didn't start in the required time while trying to run some app on your Windows. Learn more?

Solution 1:
1. Always Keep installed apps up to date.
2. Assure the license for an app is still valid and synced (if needed).

3. Run the troubleshooter for Windows apps@ aka.ms/diag_apps10

Solution 2: Make sure that the date and time are correct on the computer.
Solution 3:Clean boot your own system like this...
Solution 4: With the admin access, run the below command in PowerShell:
get-appxpackage *Microsoft.Windows.Photos* | remove-appxpackage
Afterwards, (Uninstall and/or) reinstall the problematic app. We just take the Photos app for Windows 10 here.

Optionally, perform a thorough malware check in Safe Mode using the recommended avast Internet Security in this video.
Other voices:
1. Check if the app has been blocked by system or some 3rd-party firewall software.
2. Give Google DNS a go.
3. Change the file permissions of the Windows folder. Note, by default, Read & execute, List folder contents and Read should be enabled.
4. Change HKEY_USERS, HKEY_CLASSES_ROOT, and HKEY_LOCAL_MACHINE (which are located in Registry Editor) permissions.
Make sure that permission to Read is set to Allow.