I know that you are exacted as much as we are, but please before upgrade - make a full backup! Always ! Then upgrade (re-install), then clear in Browser and Joomla! all cached files.
SP Page Builder Frequently Asked Support Questions and Answers
Make sure that you have PHP 5.4 or higher ! Very important and minimum requirement. BTW, We are still recommending to use PHP 5.6 or higher http://php.net/supported-versions.php
Version 2.x is a component rewritten from almost zero, so please be tolerant for our hard work, we are only people. Yes, we still improve/update our tool.
Note: Before start developing site with Page Builder, please read manual https://www.joomshaper.com/documentation/joomla-extensions/sp-page-builder-2-x