Upgrade concrete5 from 5.5.2.1

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So, long story... I built a website for a customer about 6 years ago. Handed over the hosting and tech support to another company. Now they're contacting me because the site isn't running anymore since they updated the server to PHP 7.1.20.

Downloaded all the files, backuped the database and installed a fresh wamp server on my desktop pc. Site is running perfectly fine now, but I can't get it updated. I get the "unexpected error has occured"

 
ConcreteOwl replied on at Permalink Best Answer Reply
ConcreteOwl
Updating legacy sites is something I have been doing quite a lot recently.

I suspect you are trying to update from the dashboard using the auto-update method whereby your browser attempts to connect with the concrete5 site to download the updater files.

My advice is, download the new core manually and extract it into your updates folder then run the update from the system and settings page.