Build 26300.8142 is a new Windows Insider Preview build being offered to devices enrolled in the Dev Channel via Windows Update. It appears in Settings > Windows Update on eligible Insider devices and can be installed like any other Dev Channel flight.
No additional details about build 26300.8142 (features, fixes, or known issues) are provided in the available context beyond similar historical examples of Dev Channel build announcements.
References:
- The Changelog
- Build 20206
- Build 20231
- Build 21313
- Build 21327
- Build 21337
- Set up a Dev Drive on Windows 11
- Any Updates from windows 11 release preview 26220.6690 - Microsoft Q&A
- How to install 25H2 enablement package? - Microsoft Q&A
- My system has been on RP channel why is it downloading a Beta release? - Microsoft Q&A
- Release Preview channel seems to be missing - Microsoft Q&A
- Problem updating to the latest preview insider channel build - Microsoft Q&A