On, the content in Volumes 1-4 of The Gospel Project for Kids will change content delivery from portfolios to zip files. The remaining volumes will also deliver in this format. This change may take place when you are in the middle of a volume, and you will notice the changes when you login to access content.
Zip folders are divided by unit instead of session, so they should be easier to use and quicker to download. You will be able to download the entire zip file for a unit, or you can download items as individual PDFs.