Use exactly these parameter names (case-insensitive) and ensure spaces and slashes are correct.
DISM /Online /Cleanup-Image /RestoreHealth /Source:wim:D:\sources\install.wim:1 /limitaccess dism error 87 fixed
Ensure there is a space between parameters (e.g., between /Online and /Cleanup-Image ) and that hyphens are placed correctly. dism error 87 fixed