If you have been testing Windows 10, you will know that it comes with two Store apps. One is the old Windows 8 Store app with a green market icon and the other is the fresh one in beta stage at this moment (has a grey tile). Starting with build 9926, the Store Beta app offers Insiders the ability to test universal Office Preview apps. However, some users have been facing an issue when they open the Store beta app. It refuses to open or shows error messages about not being able to update. Here is how you can fix the issue.
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