OK, so I want to update my Shop Channel without updating the system menu version, so I found that Dop-SHOP would do the trick, correct? However, it makes a note that you must install the next version of the shop channel than the one you currently have to be safe. Problem is, the oldest version available for install (v18) is two versions ahead of my current shop channel (v16). I'm on System Menu 4.0 in case that helps. So, what do I need to do?