Slow and Release Preview Insiders will receive error 0x80073715 when installing KB4015583

Windows Insiders moving from Fast ring to Slow or Release Preview rings may receive an install failure with error code 0x80073715 when installing KB4015583 (Build 15063.14).

Microsoft today announced that this error is an expected one as they have released a different version of the KB to Slow and Release Preview rings which fails to install on the version of the KB that went out to the Fast ring. So, you don’t have to worry anything about it. Windows team will release appropriate updates to your PC as long as your OS build number is 15063.14.