In fact, the release candidate of Windows 7 appears to be better than some final version of predecessors with Service Pack. Therefore, an update will appear on the final version not absolutely necessary. Nevertheless, it is recommended strongly, because although optical nothing has changed, but certainly in hundreds if not thousands were reworked, small errors and also at safety. Do not forget, an RC is not exactly final, but just another beta release with nice name for it and in no way intended to be used productively. Due to the fact that one system that has an unsupported and the basic personal dislike of upgrades I still strongly recommend to make a clean start but to each his own and so far I have all those who have made an upgrade given the feedback. So do that at your own risk.
Officially, the process of updating a Windows machine to Windows 7 is possible only from Vista. For those who have installed Windows 7 Windows 7 Beta or RC, it is possible to update your installation to RTM Windows 7 using a small tip. The process is not supported by Microsoft or recommended, but it works. It is already an ISO that you have your install of Windows 7. Then download the software from Microsoft MS USB / DVD Download Tools that can deploy this iso on a USB stick or DVD. The solution is to edit a file inside the Windows 7 DVD and do that you need to extract all the files that contains the Windows DVD Maker 7 on your hard disk.
If you use an ISO image in Windows 7 for the installation progress, you can use 7-Zip utility that allows you to extract the ISO to a folder from drive. If you use a real DVD, you simply copy all files from the DVD to a folder on your hard drive. Once you have extracted the files, open the folder sources for the file cversion.ini. Make sure to install it on a USB key and then be able to edit files. Once that is in place on the USB drive, edit the source file cversion.ini and change the value of MinClient in 7100 or 7000.
Once you open the file with Notepad cversion.ini, you will notice that the line MinClient (MinClient defines the minimum version number required to update a pre-release version of Windows 7) to a value of 7233.0, and MinServer (MinServer defines the minimum version number required for the migration of a pre-release version of Windows Server 2008 R2.) value of 7100, so you can understand why the update does not work. All you need do is change the value MinClient to a value less than or equal to 7100 for MinClient, for example you can change it in 7000 and do not forget to save the change. Save the changes and then run the setup.exe file in the root folder where you copied the files Windows 7. Your installation should normally begin, and the prompt window click Install Now. Once you reach this screen, choose the Upgrade option
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