adding adjust adjusted admin allowed attempt attempts buyer buys click customer download downloads edit file filling indicates information limit limits number options product purchase purchaser putting recommend require saved total upon url words

On the "downloads" when I'm filling out the information, if I put "1" download in, that means each purchaser gets one download upon purchase, or a total of one download off that url?

It indicates the number of attempts allowed for a download. Although I will recommend putting at least 3 as sometimes a buyer might not realize where they have saved the file and might require more than 1 attempt to download.

When a customer buys one of my downloads, I want to limit the purchase to one download and that's it In other words, the customer should not be able to go back and download the same file again. Ho do i Do that ?

Download limits can be adjusted from Admin > Edit Product or you can click "more options" while adding the product to adjust those.