I cannot get past the back-up option when attempting to update Statamic from /cp on localhost. I can see that back-up zip files are created in /local/temp/backup and the new version of Statamic is downloaded - but that's it. I have also run update from the command line using php please update but I get this error:

[Symfony\Component\Debug\Exception\FatalThrowableError] Class 'ZipArchive' not found

I'm using MAMP Pro and have zip extension installed (according to phpinfo).

What else do I need to do to get round this?

Answered by Clive Walker! Go to answer.