You can load each folder (file) into sigil individually. Once there, select all the images and right lick then select "rename". This allows you to define a template to rename all the images you selected. Eg: img01-01.jpg. Sigil will automatically increment the last number AND update the links in your HTML file...img01-02.jpg., img01-03.jpg. Etc. then save the files back to the hard drive - I recommend a different folder...
Do this for each folder. Then you can combine them all at the end.
Hope that helps!
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