Also, downloaded the new version (1.4.4.2) and copied the jbcore folder to the jbcore folder under:wp-content/plugins/wp-juicebox
In order to upgrade WP-Juicebox, you need to replace all the WP-Juicebox files (not just the 'jbcore' folder).
The 'jbcore' folder contains the core Juicebox files which are used to display the galleries in the frontend.
The other files in the plugin handle the integration within WordPress, the user interface and the backend functionality.
Once you have replaced all the WP-Juicebox files, make sure you upgrade the plugin to use your Juicebox-Pro v.1.4.4.2 'jbcore' folder following the Upgrading to Juicebox-Pro instructions in the plugin's support page.
Where do you get the Album name from in Google Photos?
Once logged into Google and in the Photos section, go to Collections (from the left side menu) and select Albums from the drop down menu at the top.
You can create a new Album via the + character at the top or you can click on an existing Album and click in the Title field (default text 'Untitled') to give your existing Album a Title.
You can find your Google User Id by going to your Google+ Profile page and grabbing the 21 digit number from the URL.
You can try to display one of my own test albums using the following details:
Picasa/Google User Id: 109901943277912891450
Picasa/Google Album Name: TestAlbum