Step 1: download the DupDetector software.
Step 2: click on "Get Data" and "Build". Select the right folder where your downloaded pictures are.
Step 3: go to "Find dups" and set it to 100% and 100% for the best results.
Step 3: click on "Find dups" next to the percentages.
Step 4: let it find the duplicates, the highest amount is 1000 pictures so it may take a few tries.
Step 5: press to remove duplice, for high speed hold the enter key.