Hello, I have made a grand mistake and have deleted the PDF to my ebook on my computer when I did a out-of-the-box recovery. Is there any way for me to download what I uploaded on this site?
Yes, there is.
Go back onto your bookshelf, click on the small grey box to the far right of your book and select Edit ebook content. Just below the box where you uploaded your manuscript, there's the option to download a copy to your laptop. I think the options are html or mobi, from memory.
If you select the html version you should be able to convert it back to a pdf if that's what you want to do once it's downloaded.