For apps originally downloaded through the Windows Store, they can only be installed and used on up to five Windows 8 devices. However, Microsoft expects to release updates from October 9 so that users can have up to 81 Windows 8, or will soon be available. Windows 8.1 devices install the same App content through a single account installation.
According to Microsoft's earlier disclosure, echoing comments previously made by developers in Build 2013, an update will be released on October 9, offering users up to 81 Windows 8 and Windows 8.1 devices installed via a single account. Same app content.
Earlier in the Windows 8 platform, downloading content on the Windows Store through a single account can only be installed and used on five devices. The original design intention was mainly on App Appropriate Use Protection to prevent content from being abused and pirated. However, it may be troublesome for developers or OEMs to design test applications, so Microsoft decided to relax the use restrictions.

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