Purchased Enfold theme – WordPress says it cannot load as it is out of date

PHP 5.6: Support expires end of 2018

Security support for PHP 5.6 will expire at the end of December 2018. Already in January 2017 the developers stopped the function updates for version 5.6. The end-of-life date – i.e. the end of any support – was already postponed by one year back then, as the script language version PHP 5.6 proved to be extremely popular.

So I think you should check with your hoster to update.

PS: many hosters still offered their own support with security updates, but often this support was charged. So if you were informed that you had to pay for them, you should cancel this support after the change to newer versions.