Does it sound weird to you? If not, you are definitely dealing with latest technologies or smart enough to understand the other way of doing so :). Today when I read one of such problem, I was feeling sad about the person who had received a PSE box as a gift and doesn't have DVD drive on his machine. For some time I was blank and feeling uncomfortable in replying to that person on Adobe Forums. But of course, there is a solution to every problem and companies like Adobe provide enough solutions to deal with such situations. Let's discuss more around this interesting incident with more light on latest technologies, where Hardware limitations can be overcome.
This is a new ear of Cloud Computing and many of the software companies are moving to online solutions. Although Desktop products by Adobe are not that path for now, but solutions to such problems exist.
Good part is that software delivered in boxed form in various retail stores or online shops like Amazon.com are also available as Download. But does a user need to pay for download again. No !! Because licensing is mainly governed by serial key you have, you can simply download trial version of Adobe Photoshop Elements and use the serial you have purchased with box. This was pretty simple solution but somehow it got missed fro my mind and thought of sharing this today :)
As an additional information, Adobe Photoshop Elements downloadable version is also available on Amazon.com now.