How to Disable store for Windows 10 Pro

Go to GPO Policy

COMPUTER CONFIGURATION > POLICIES > WINDOWS SETTINGS > SECRURITY SETTINGS > SOFTWARE RESTRICTION POLICIES > Additional Rule

Right click and select New Path Rule.

Path: %programfiles%\WindowsApps\Microsoft.WindowsStore*

Security Level : Disallowed

It is VERY important to use the ‘*’ wildcard in this path because Microsoft will change the path as they update the STORE application over the coming years.