Yesterday Microsoft released Windows 8.1 for the public, If your system is running on Windows 8 then you can get Windows 8.1 as a free upgrade through Windows Store.
If users running on Windows 7 or older windows wish to get latest version has to purchase Windows 8.1 basic version for $119.99 (€90) or professional version $199.99 (€150).
But if you wish to try out 8.1 before purchasing it, then Microsoft is offering a free trial version of Windows 8.1 for 90 days. Depending on your system architecture you can download either 32-bit or 64-bit ISO file of 8.1 at this Microsoft page, but the Redmond company is only offering only Enterprise editions of Windows 8.1 for the 90-Day free trail.
“Windows 8.1 Enterprise provides IT professionals with a reliable and easy-to-manage infrastructure for today’s changing and increasingly mobile work styles. It’s the fastest and most secure OS from Microsoft for desktop, laptop, or tablet,” according to Microsoft.
If you wish to try out this trail, then you need a Microsoft account to download the ISO of 8.1 Enterprise edition and the trail is available or supports following languages: English (US, UK), English German, Portuguese, Russian, Spanish, French, Italian, Japanese, Korean, and Chinese (Simplified &Traditional).
Download : Windows 8.1 Free 90-Day Trial
Update [31/05/2016] : If you are looking to download Windows 7 / Windows 8.1 ISO images easily, then use this free & tiny tool called Windows ISO Downloader.
Windows 8.1 update Failures:
It seems some users are experiencing problems in downloading the 8.1 update, Microsoft says installing e latest patches through Windows Update will fix these problems.
If for some reason you can’t see the 8.1 Update in the Windows Store, then try this small trick. Go to this page, under “Updating to Windows 8.1 or Windows RT 8.1” section click on either one of the link and it will launch Windows Store displaying the Windows 8.1 update.
Also there are reports that some users are experiencing problems in 8.1 installations, some users are getting 0x80070057 error and it’s expected that Microsoft to release a workaround to fix this error.