Dropbox Dash fails t install correctly

Command E has been purchased by Dropbox 😭. Having gone to the trouble of finding the installation file for Command E, which seems to be very well hidden (by Dropbox?) and then installing it, all I got was a message that said I now have to install Dropbox Dash that replaces Command E . Why didn't the Command E home page say this!!! 😡 But it didn't so, having already wasted my time on a useless install, I pressed on. On my third attempt 😭, I managed to (supposedly) complete the installation of the Dropbox Dash app. I obviously then looked forward to starting up the app and searching my desktop --- which is what the app is meant to do (the Everything app so far remains so much easier!).  With a press of control + E, what I got, instead, was an error message 😡 that reads:

"commande://www.dropbox.com/oauth-redirect?code=utVurZ502fkAAAAAAAAfdwLLaMn...
This file does not have an app associated with it for performing this action. Please install an app of, if one is already installed, create an association in the Default Apps Settings page."

(The address that heads the error message is obviously longer but the error message window cuts it off and cannot be widened!)

Since I have already done everything I have been instructed to do during the TWO 😡 installations, I assume I have to go to the "default apps settings page" (which doesn't appear to be called the "default apps settings page" and instead seems to be just the "apps" tab --- unless it isn't that, in which case it's unclear what or where it is!). On the Dropbox|settings|apps page, clicking on Dropbox Dash expands it and below it there is a "Disconnect" button. Now I may be foolish but I take this to mean that Dropbox is, that's IS, connected. So why doesn't the thing work?

This is one of the worst installations I've ever encountered. Atrocious is too kind a description. What am I meant to do next?

Any help appreciated or maybe Dropbox would like to make this a whole lot simpler?