Try this from here
Method 2: Clear the Store Cache
You may try these steps to clear the Store cache and check if that helps:
a) Press the “Windows Logo” + “R” keys on the keyboard.
b) Type “wsreset.exe” and press “Enter”.
c) Reboot the computer and then check if you are able to open the Windows Store and all the other apps on the computer.
If that doesn’t help, then you may try re-registering the Windows Store App by following the instructions given below and check if that helps.
Method 3: Re-register the Windows Store App
To re-register, please try these steps:
a) Press “Windows Logo” + “Q” keys on the keyboard and type “cmd” in the search box.
b) Right click on the “Command Prompt” icon from the search results and select “Run as administrator”
c) On the command prompt window, copy and paste the following command, and then press “Enter”
powershell -ExecutionPolicy Unrestricted Add-AppxPackage -DisableDevelopmentMode -Register $Env:SystemRoot\WinStore\AppxManifest.xml
d) Check the result displayed on the command prompt window.
e) If it was successfully processed, then type “Exit” and press “Enter”.