Microsoft has not only released the Insider Preview Build 18298 in Fast Ring (see Windows 10 Insider Preview Build 18298). Today also the older Insider Preview Build 18290 of Windows 10 was released as ISO file.
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The reason for the provision of the ISO is that the old Windows 10 Insider Preview Builds expire on December 14, 2018. The announcement of the ISO file was made this time via Twitter:
We have released new ISOs (with an updated expiry date!) for download @ https://t.co/l8663ySB0P.
NOTE: this was not a Slow ring release, it only went to Fast. We wanted to provide new ISOs to aid users are having trouble updating and may hit the build expiry scenario.
— Windows Insider (@windowsinsider) 11. Dezember 2018
The ISO download of this build is possible for Windows Insiders from this page. Notes about the build 18290 are available in the blog post Windows 10 Insider Preview Build 18290 released.
