On October 14th of last year, general support for Windows 10 came to an end. If you wanted to keep using Windows 10 without sacrificing security, you had to enroll in the Extended Security Updates (ESU) program. And if you did that, you should now install the latest update. Update KB5075039 , which is for Windows 10 ESU and Windows 10 Enterprise LTSC 2021, fixes a bug in the Windows Recovery Environment (WinRE). According to BleepingComputer , there have been problems with the recovery feature of Windows 10 since October, despite the fact that we’ve seen several updates since then. Per Microsoft’s update notes: This update automatically applies Safe OS Dynamic Update (KB5073933) to the Windows Recovery Environment (WinRE) on a running PC. The update installs improvements to Windows recovery features. The following is a summary of a known issue that this update addresses when you install this update: [Windows Recovery Environment (WinRE)] Fixed: WinRE would not start after installing the October 14, 2025 update KB5068164. You’ll need at least 250 MB of free space in the WinRE partition to install this update. The update won’t be offered to you if you don’t have enough free space in WinRE, or if you don’t have a WinRE partition at all. To install the update, you’ll find it in Windows Update by navigating to Start > Settings > Windows Update > Check for updates . This particular update is only available via Windows Update.