Howdy Moize,
I am filling in for Cliff today. We do not offer a way to download tickets or make them attachments currently. The HTML tickets we currently use are supported by smartphones, email clients, and web browsers to such a degree without downloading any extra applications. So we have stuck with them for their elegant simplicity. That said we are always open to feedback, and have been getting some about this with people wanting PDF tickets and not wanting to use EDD Tickets (since EDD natively has PDF support and thus offers downloadable tickets). If you would like to see that as well please vote your support on this request.
Let us know if you need anything else. Cheers!
– Brook