If you are trying to repair a Windows 10/11 image using a DISM version from an older OS (like Windows 7 or 8.1), it will trigger Error 87 .
Win 7 uses alternative parameters or the System Update Readiness Tool . Command line parameters fail to trigger. Relaunch using Run as administrator. dism error 87 fixed
He typed slowly, carefully, constructing the syntax in his mind. He needed to specify the source image. /Image:D:\Windows (Target the offline Windows directory). Wait, that was for the old tool. For DISM restore health, he needed to point to the source file to pull the good files from. If you are trying to repair a Windows
An outdated operating system can trigger compatibility issues with DISM. Open ( Win + I ). Navigate to Windows Update. Click Check for updates and install any pending packages. Restart your computer. 📊 Summary of Common Errors What Happens How to Fix It Missing Spaces DISM/Online... throws Error 87. Add a single space before every / symbol. Windows 7 Usage /RestoreHealth is unsupported on Win 7. Relaunch using Run as administrator