The Windows 10 Technical Preview (version 1511) was released on November 10, 2015. The preview was intended to be downloaded for free, but it requires a valid Windows 7, 8, 8.1, or 10 license. It provides a glimpse into Microsoft's future direction for the operating system, and is expected to be released as a fully functional version of Windows 10 sometime in 2016. Windows 10 was released for general availability on July 29, 2016.
Windows 8.1 was released on October 17, 2013, with a new User Account Control, a new taskbar, and new shortcuts, as well as several changes to the interface. The Windows 8.1 update also features a new version of Internet Explorer, version 11. The Windows 8.1 update was made available as an optional download for Windows 8 users on November 12, 2013; Microsoft had said that it planned to roll out Windows 8.1 updates to Windows 8 users exclusively via an over-the-air update rather than via a full download. However, the November 12, 2013 update to Windows 8.1 only rolled out to users in the United States, United Kingdom, and Canada, while users in Germany, France, and Italy were notified that the update was ready for download but the download would not be available until the next day (November 13, 2013). Windows 8.1 was released worldwide on the x86 version of Windows on October 17, 2013, and on the ARM version of Windows on October 24, 2013. Microsoft announced a supported lifecycle for Windows 8.1 in January 2014, which states that it will receive security patches and technical support until January 10, 2020.
The value of the subj-param is the encoded SubjectPublicKeyInfo of the desired certificate subject, as specified in X.509. If the value of this attribute is missing, or if it contains an invalid certificate subject, then the user will be prompted for a subject name, and an attempt will be made to substitute the provided name to generate a subject key pair for use in the keygen process.