No you cannot download more HDD space. No you cannot download a tool to make it an SSD...

I love the Reddit thread Tales from Tech Support. It is where I find so many awesome stories that help me feel better throughout the day. This one comes from Reddit user tyo445. Please check out this thread. If you have never been on Reddit, this is an awesome place to start.
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I build computers where I live and that apparently qualifies me as an IT person. A woman nearby that wasn't very good with technology called me to come and fix Microsoft Word for her. I showed up and her hard drive was full. I tell her that her drive is full and the conversation went like this:

Woman: "That's impossible! I just downloaded 8 more terabytes."

Me: "You can't download more hard drive space"

Woman: "Why not? You can download tools to turn them into SSDs why not download more space?"

Me: "Because that's just not how it works. You can't turn them into SSDs either"

Woman: "You just don't know what you're talking about! I know exactly how this works. The faster the drive spins the more storage it has!"

Then she kicked me out because she didn't trust that I knew what I was doing with her computer.

Source: http://www.reddit.com/r/talesfromtechsupport/comments/3b4vsa/no_you_cannot_download_more_hdd_space_no_you/