https://wccftech.com/download-windows-10-1809-iso/

Windows 10 October 2018 Update is already here, surprising those signed up with the Release Preview ring. Several reports had confirmed last month that the Redstone 5 Insider Preview Build 17763 appears to be the Release to Manufacturers (RTM) build. We also saw reports that Microsoft could drop the October 2018 Update for everyone on October 2, which is today. However, since the build was never released to the Release Preview ring, everyone expected for the release to be pushed to next week.

Surprising everyone, Microsoft has now made Windows 10 1809 available for everyone. You can now download Windows 10 1809 ISO files for your compatible PCs.