Build 26300.8346 is a newer Windows 11 Insider Preview build for devices in the Dev Channel, which is in the process of transitioning to the new Experimental channel.
For devices already enrolled in the Dev Channel:
- Open Settings > Windows Update.
- Ensure the device is still in the Dev Channel (which will move to Experimental as part of the new Insider channel changes).
- Turn on the toggle to get the latest updates as they are available if present.
- Select Check for updates and install the build when it appears.
Key points about these Dev/Experimental builds:
- They are based on Windows 11, version 25H2 delivered via the enablement package (KB5054156).
- Many features are rolled out gradually using Controlled Feature Rollout, so some devices may see new features later than others.
- A desktop watermark in the lower-right corner is expected for Insider pre-release builds.
- Features in these builds may change, be removed, or never ship beyond Windows Insiders.
If the build does not appear immediately, keep the device enrolled in Dev (soon Experimental), keep the “latest updates” toggle on, and check Windows Update periodically as rollout expands.
References: