Problems updating Pantone Connect Plugin

Can anybody help.... I have been trying to update Pantone connect plugin today with no success. I keep getting a permissions issue, all log in details are correct, I have tried everything suggested by Adobe live chat and in the end they suggested the forum.

I have an old mac, but do not have it cluttered with stuff, I only use it at work with Adobe CC, the only plug in I needed was Pantone connect and now that will not update (or now install, as I tried an unistall/install thinking that may be the answer). Any help or ideas would be appreciated, as I cannot use any of the new colours (eg P2202C) which are now pretty basic.

I have attached a pic showing the message I am getting, I work on a stand alone Mac, not connected to anything else, no one else uses or has access to it, also, I am not a techy person who messes about with settings etc, so nothing has changed, other than updates.

Ideas welcomed