EDD Download page post template

Hi. I need some advice on Easy Digital Downloads. So I’ve developed my download, and have uploaded it. But the default page layout the download lands on is a standard post page, which has the right sidebar with the Search, Meta, and Archives widget, even though I’ve placed them in my inactive widgets at the bottom of the widgets panel.

According to the Easy Digital Downloads support page, the way to fix this, is by editing the .php files, but to be honest, I’ve never changed anything in these files and it’s really above my capabilities. If I break anything, I won’t be able to fix it.
Is there any other easier way to let the download display on a full-width page instead of the standard?
According to the EDD support page EDD will use the single.php template file in your theme to display the download page. The single.php template will oftentimes include a call to the sidebar using the get_sidebar() function.
So my question is if there is any way that I can override the get_sidebar() function on a single download using the Additional CSS tab?

The page I need help with: [log in to see the link]