Update from PHP 7.0 to 7.4 breaks page editor

Hi there,

I’ve recently taken over the SEO efforts for a client who’s running a child theme on Enfold. I tried updating the PHP for the site from 7.0 to 7.4, however, this ended up breaking the editor section for any page on the site. By breaking it I mean it just gave me the spinning wheel of death. I think this is because the Enfold version (3.4.7 is running deprecated Jquery functions (i.e .Live).

I tried to get the themeforest key from the client but they said because it was built in 2014 they’ve either lost it or their developer at the time failed to send it across as they didn’t know they’d need it.

My question is, if I bought a new key, would I be able to simply update the Enfold theme or would the key need to match up with the site (not entirely sure how it works).

Also the child theme was custom built by the developers back in 2014 so I’m afraid this could also be an issue?

Any help would be greatly appreciated. I feel as though buying a new key would be the right thing to do but I don’t want to purchase one if I’m going to be in the same situation.

Thanks,

Jake