I have adjusted your account so that you now have access to both versions. Keep in mind, it's not a good idea to switch back and forth as each version contains elements that are not compatible with the other.
Also, I noticed you have one site that was started with SB+ and contains the master template feature. That site will not allow you to edit it with the desktop version.
IN addition, the desktop version has some old widgets such as hit counters, weather widgets etc. it does not contain the new features for things like editing pictures, rounding corners, adding shadow effects, and the master templates.