you could perform this command in Command Prompt tool easily, but people dont always succeed.
TheDISM source files could not be founderror will show up when DISM failed.
How to fix DISM failed.
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No operation was performed?
TheDISM restore healthprocess could be interrupted in Windows 10 or other Windows systems.
This post shows you the step-by-step guide.

yo follow the fixes below.
#1.
Use Windows Repair Upgrade
Step 1: download Windows Repair Upgrade tool.

Step 2: start the Windows repair process on your PC.
How To Recover Files Using CMD: Ultimate User Guide?
#2.

Clean & Analyze the WinSXS Folder
#3.
Use an Alternative Repair Source in DISM
Step 1: check the Index number on your Windows 10.
Step 3: wait for the operation to complete.
What about DISM error 2?
How to fix it when finding DISM unable to dive into the image?