Microsoft wants to attract Windows users 7, 8 and 8.1, offering a free upgrade. To obtain it, you must have a valid license key. However, if you use Windows XP or Vista, you should pay for the update of Windows 10. Deadline for this transition
The free update for Windows 10 shall be valid for one year from its official date of release, 29 July 2015. After this period, you’ll pay between 80 and 200 €. Validity of the update
If you upgrade your Windows before 29 July 2016, you can use the new windows 10 redstone operating system windows 10 key store version definitely. Requirements
If you have a valid license key for Windows 7 or 8, you can decide windows 10 redstone concept if you prefer the older version or the Windows version 10. The installation of the Flash drive and the ISO file
The upgrade can also be done via an ISO file or Windows Update. If you have little space on your Windows tablet, you can store a bootable Flash drive and install it from the same tablet.