If you are unable to install or update metro apps through Windows Store after upgrading my system to Windows 10. The problem arises due to the excessive cache files that clutter-up your system, causing various issues including this one. This problem could be solved by cleaning those cached files, which can be done using these steps
1. Clear the Cache Follow this Method; Delete the old OS;
1. Press Win+R keys to open the Run dialog
2. Type “WSReset.exe” and click OK
3. A blank, black window will appear that will auto-close after sometime
4. Try installing or updating apps now
2- Windows Firewall is disabled ;
If the Windows Firewall is disabled, you will not be able to install the application from Windows Store. So the first thing you have to check is whether the Windows Firewall is turned off or not. To access type in Firewall in Start Search, and click on the result to open it. You could also navigate it as follows – Control Panel\All Control Panel Items\Windows Firewall. Here you have to make sure that it is turned on. If some strange reason you’re unable to turn on Windows Firewall, open Services Manager and check if the Windows Firewall service is stopped. Type services.msc and click on Services, and look for Windows Firewall. Now make sure that the service is set to Automatic and Started.
3- Incorrect Date & Time;
If you have incorrect Date and Time set on your computer, you’ll have issues installing applications from Windows Store. You may even receive a message: The time setting on your PC might be incorrect. Go to PC settings, make sure the date, time, and time zone are set correctly, and then try again. So make sure you have the correct date, time. You can change it from Regional Settings from the Control Panel.
4- Run the Troubleshooter;
The Windows 10 Store Apps Troubleshooter is a great built-in tool from Microsoft which can help you with apps installation problems. You may want to run that and see if that helps. This automated tool will help you if your Windows 10 Store is not working.
5- Reboot in Start-up Mode;
The To reboot the system in Selective Startup or Clean Boot State.
1. On Desktop press Windows + R. This opens the run window
2. Type in MSConfig and press Enter
3. Under General tab uncheck on “Load Startup items.”
4. Under Services tab check on “Hide all Microsoft services” and click on Disable all Now reboot the system and try to install it again