Yes, under certain circumstances you can still get it for free.
But you must act quickly. The plan is that the ability to get it for free will end at the end of this year, 2017. In other words, as of the date this is published, you have only a couple of weeks left.
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Windows 10 is still technically available for free for those using assistive technologies.
Microsoft doesn’t intend this as a way for folks who don’t use assistive technologies to upgrade, but they never ask for any proof that you do. Nor do they really define exactly what it means to use assistive technologies. Some take it to mean things as simple as increasing the screen magnification or having run the magnifier tool.
As with the original free offer, this is only available as an upgrade to an existing installation of Windows 7 or Windows 8, and will get you the same edition, Home or Pro, as you already have. This will not work for a new installation. Of course, if you have a legitimate copy of Windows 7 or 8, you could install it onto a new machine first and then upgrade that to Windows 10 for free.
This free offer ends on December 31, 2017.
After that, or in situations where you’re not eligible or not upgrading an existing installation of Windows 7 or 8, you’ll have to purchase Windows 10.
Getting the upgrade
From the machine running Windows 7 or 8, visit this Microsoft webpage: Customers who use assistive technologies can upgrade to Windows 10 at no cost.
Click “Upgrade Now” to download and run the installer.
That’s all there is to it.
After the deadline
Once the deadline passes, or if your machine isn’t eligible, your only real option is to purchase a copy of Windows 10. Honestly, that should be a pretty rare situation, as most new PCs come with Windows 10 pre-installed. If not, or if you’re installing it on an older or other computer that did not come with Windows 10, many computer and online stores offer Windows 10 for sale.
As always, if you are purchasing Windows 10 or otherwise have the option to do so, I do recommend springing for the Pro edition. It has a couple of features and conveniences that the Home edition does not, the most interesting being BitLocker, the Group Policy Editor, and Remote Desktop. You can see a more complete comparison here.