If you are a Windows Insider member, but have not yet updated to the current 10240 build of Windows 10, now would be a good time to do so. Microsoft is now requiring build 10240 to be installed so that Windows 10 users can access the new Windows Store.
Gabriel Aul, the head of the Windows Insider team, posted a message on the Insider Hub app for Windows 10.
Aul added that the Store version number should be 2015.7.22.2 or greater.
Source: Gabriel Aul (Twitter)
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