Those checklists for idiots are annoying, when you have an error & searching for a cause that you already know is not simple. For a long time Windows user from the early 1.0 since 1987 through server and professional workstation versions to the Windows 10 build 2004, I kind of know what to do, but this "old version" - "error 2" -> fail -> loop is something that is annoying and seems to fight all possible remedies.
It starts with the text box that you have the old version of Dropbox app. The app works, but the annoying text box cannot be clicked off , it accepts only the "update" selection, and the update just fails. So I used the app for a couple of months by pushing the text box aside. It is like you got a text message from the Dropbox Company: "you are an idiot", only the "yes" button is active, and after checking it, the box comes back , on top of every app you are using. If you still need to use the app, do not unistall it ! It won't install back and you are left without a working app. And of course, there is always this small doubt, what if the Dropbox cloud is found empty after these trials to fix the app. So first, you want to prepare a hardware backup. With several gigabytes, tens of thousands of files, you are kind of *not* going to do it easily and not fast, anyway. At this point, the idea of totally relying on a cloud service seems to be a very very very bad idea.
So no rollback of the erroneous app could not be found, the cause of the "error 2" seems to be connected to older harware, Windows 10 still works well, but not the Dropbox app. Fortunately we had other computers to install the newest app, but this is not perfect, because we have a special application that needs to reside in the certain workstation (a dongle) . That's the reason these old workstations sometimes are needed.
It is strange that the M$ Onedrive applet has been working well all the time. Do they know something that Dropbox people do not know ?
