SP Page Builder Pro 3.5.3 is ancient compared to the modern iterations of the builder (Version 5+). Using this version means:
Using a "nulled" or cracked version of a premium Joomla extension like SP Page Builder Pro often leads to more problems than it solves: sp page builder pro nulled 353
This guide will explain why you should avoid nulled extensions and the dangers of using version 3.5.3 in particular. What is a Nulled Extension? SP Page Builder Pro 3