Deleted Multiple Files

1. I was downloading 80+ worth of pages. 2. It was shown finished downloading. 3. i didn't deselect the downloaded ones while I was planning to delete spare pages, so I also deleted the ones I didn't want to delete. 4. I clicked delete but then the screen shows: "error" 5. I couldn't undo the deleted action and the undo button is gray. I could have recovered the deleted pages with CTRL + Z but because it had an error I now lost 80+ worth pages of effort. PLEASE help me recover the files 😞