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You tried to follow a link in the help file which is not available online. Only the step-by-step guide is accessible on this website. But please feel free to download the complete help file or try the demo of DoubleKiller Pro!

Step-by-step guide
Step 1: Adjusting comparison settings
Step 2: Adding folders
Step 3: Using filters
Step 4: Start scanning
Step 5: Checking files
Step 6: Removing files
Step 7: Saving results
Step 8: Saving the settings