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The downloadable version doesn't seem to save pictures, either. For me, it goes through the save dialogue, but doesn't actually produce the file. Very useful tool nonetheless, thanks for sharing 👍

I had the same issue, the fix was to change the output directory. I think the program doesn't allow outputting into the same directory as the program's files, so just changing to any other directory then allows you to output. After that I had no problem saving.