You can not upgrade the premium extensions like SP Page Builder Pro, Quix Page Builder Pro, SmartSlider 3 Pro or any other extension used in the template and bundled in the quickstart package.
If you are trying to upgrade pro extensions, they will be reverted to free version because we don't have the right to distribute license key along with the extension. We can only provide you the activated version of the extension within the quickstart package. If you want to upgrade to latest version of the extension, you need to purchase the license key from the respective extension developer.
You can find the latest file for the extension in the extension folder of the respective template. You just have to upload that file manually with Joomla installer.
Note: Please take a full backup before making any change.
JoomDev is not affiliated with or endorsed by Open Source Matters or the Joomla! Project. The Joomla! logo is used under a limited license granted by Open Source Matters the trademark holder in the United States and other countries.