UPDATED 7/24: Although Microsoft doesn’t offer a direct upgrade path, it’s still possible to upgrade your PC running Windows XP or Windows Vista to Windows 10.
https://techjourney.net/windows-vista-anytime-upgrade-how-to-upgrade-edition-guide-and-price/ http://www.shopfujitsu.com/www/content/support/mobile/windows_7/ https://forums.anandtech.com/threads/upgrading-windows-vista-oem-to-windows-7-cheapest-method.2250281/ https://bgr.com/2015/06/20/windows-10-free-upgrade-xp-vista/ https://www.askvg.com/windows-8-upgrade-paths-for-windows-xp-vista-and-7/ http://solutions.us.fujitsu.com/www/content/support/mobile/windows_7/index.php https://www.makeuseof.com/answers/reinstall-windows-7-upgraded-windows-vista-upgrade-version/
https://bgr.com/2015/06/20/windows-10-free-upgrade-xp-vista/ https://www.askvg.com/windows-8-upgrade-paths-for-windows-xp-vista-and-7/ http://solutions.us.fujitsu.com/www/content/support/mobile/windows_7/index.php https://www.makeuseof.com/answers/reinstall-windows-7-upgraded-windows-vista-upgrade-version/ https://www.stevejenkins.com/blog/2010/02/upgrade-or-downgrade-windows-7-ultimate-or-vista-ultimate-to-windows-7-professional-or-windows-7-home/
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Second, while the Windows 7 in-place upgrade works much better than the equivalent process in Windows Vista, there are still issues. In fact, none of the heavily used Windows Vista systems I've upgraded to Windows 7 have emerged without some problems. Some of these issues are small--like the glitches I saw in Mozilla Firefox on one system--while others are quite serious: On one ThinkPad, the optical drive mysteriously disappeared after the upgrade. I'm still trying to figure that one out.
http://rectortales.com/wmffeb/windows-10-700mb-iso.html