How To Change PHP Version via cPanel ?

Since you are in a shared hosting server,it is not possible to downgrade the php version. Your account is hosted in high end server where php 5.6.x version is available.

Using end of life or outdated versions of PHP is very dangerous as it consists of lot of vulnerabilities and security threat. It may lead hacking of your site. It is like having a anti-virus software without update. Hence we advice you to make suitable changes in your coding, so that your code will be compatible with PHP 5.6.x. We strongly advise you to review your code and then make it compatible to work with PHP 5.6.x.