Failure updating

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For a while now I have been trying to update C5 with no success, the message on the dashboard is, as ever...

"The latest version of concrete5 is 5.4.2.2. You are running 5.4.2. Update Now!"
clicking the link and downloading states:
"The following errors occurred when attempting to process your request:
There was an error unpacking your file. Perhaps you have not uploaded a valid zip file, or you do not have zip installed."


I have attempted loading a zip into packages, and even re-replacing the /concrete directory, all with it failing to update or auto-install packages.

As a result of not updating it has had my development of the site and the change in features in concrete, so I've been lagging behind, I have been dealing with bad errors and slow performance.

This has happened on 2 sites I manage, the other states
"The latest version of concrete5 is 5.4.2.2. You are running 5.4.2.
...
The following errors occurred when attempting to process your request:
An error occurred while downloading the package."
but i'm not so bothered updating it


All I want to do is update to the next highest version possible so I can update from there. Any help would be amazing.


Matt

MattGreyDesign