Insides about Windows 10 Preparation Tool for Windows 7, Windows 8

Microsoft has begun to offer a Windows 10 Preparation Tool to enable Windows 7 and Windows 8.1 to upgrade to Windows 10 Technical Preview. This upgrade will be shipped in Janauary 2015 (probably). Here a few remarks about this Upgrade Preparation Tool.


I wrote about this propartion tool within my German blog post Windows 7/8.x-Upgrade in Windows 10 Januar Build?. This tool enables Windows 7 and Windows 8.1 to receive the next build of Windows 10 Technical Preview via Windows Update. The Windows 10 Preparation Tool is downloadable for the following links.

Windows 10 Preview Preparation Tool for Windows 7
Windows 10 Preview Preparation Tool for Windows 8.1

Executing this preparation tool will end with the following message box.


In background, Windows 7 und Windows 8.1 are modified in a way, that the next build of Windows 10 will be offered via Windows Update.



I guess, at January the 21th 2015 we will know more about this step. At this date Microsoft scheduled a new press event about next steps for Windows 10.

Althought I'm asking how much sense will this be. Upgrading a production system to a technical preview isn't a serious thing (or a no go). But, as Microsoft offers an upgrade path for Windows 7/Windows 8.1 users, I'm sure, many of them will "hit the cliffs" of a beta software. Hopefully they will have a system backup and won't hit support forums with questions "help me to go back to my old Windows".

Paul Thurrott and Rafael Riviera has drawn a detailled view on the Windows 10 Preparation Tool. They documented their findings here. The Windows 10 Preparation Tool checks for upgrade eligibility. Upgrading Windows 7 to Windows 10 Technical Preview ist only possibile, if Service Pack 1 is present. In Windows 8.1 Update 1 (KB2919355) is required to upgarde to Windows 10 Technical Preivew. Upgrading to Windows 10 is only available for the following languages: "en-us", "zn-cn", "pt-br", "en-gb", "ja-jp", "ru-ru", "de-de", "fr-fr", "ko-kr", "it-it", "es-es", "zh-tw", "sv-se", "fi-fi", "tr-tr", "ar-sa", "nl-nl", "cs-cz", "pl-pl", and "th-th". Windows 10 Preparation Tool adds the following key into the registry:


A subkey Signup with value 924EADEB-2472-490D-9203-5D0A1FD5CC73 indicates, that Windows is eligible for Updgrade to Windows 10 Technical Preview.

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