If you put your system into the Windows Insider program so that you could get your hands on the April 2018 Update (aka Redstone 4) but don't want to move on to the preview of the next release (Redstone 5), it's time to drop out of the Insider program altogether or switch to the Release Preview channel.
For most of the development cycle, the two main Insider rings—Fast and Slow—offer builds of the next version of Windows. However, there's a short window within the development cycle where Microsoft is offering the current build. We're in that window right now; the Fast and Slow rings are both now on build 17134. This build has been deemed the stable build and hence was released on Monday, before beginning its wider distribution next Tuesday.
If you opt out of the Slow and Fast rings right now, your system will simply pick up the regular stable Windows updates as they're released each month. If you wait too long, however, you'll soon receive a Redstone 5 build. From there, the only way to revert to a stable build will be either to roll back the installation entirely—which normally works—or reinstall from scratch. The Release Preview ring, in contrast, will continue to track stable Redstone 4 releases for the next five or so months, up until the point that Redstone 5 is ready for release.
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