Add possibility to download asset without zipping

[JoeriE]

Description

Hi,

Right now if you download the asset from the e-mail, the asset is archived in a .zip. It would be great if the asset if immediately downloaded. For example: if it's a zip, it is way harder to open / unarchive this on a phone. It would be more user-friendly if it immediately downloads the pdf.

Thanks!

[duncanmcclean]

This will be possible in the next version of Simple Commerce, which will be released in the next month or so.