Judging by the error message, it seems that you have not extracted the files. The Pencil2D download is a zip file. Double click on that will open up a preview of the contents of the file, but you need to extract the contents of it to somewhere on your computer before you can use Pencil2D. There should be an extract all button at the top of the window, or you can follow this tutorial: https://www.youtube.com/watch?v=5Wm4PwF8DqY.
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