You must install VeraCrypt (according to your operation system) to read the encrypted source files contained in the 'container' virtual container.

Follow the instructions for your operating system in the unencrypted folders on this drive.

Do not (permanently) "decrypt" the source/content files, but instead simply "mount" the virtual drive or directory on your OS using VeraCrypt to access source/content files.  Save your work in the encrypted drive.

To access the content, open VeraCrypt and click "Select File..." in the main window.  Navigate to the removable drive file named "container_" and select "Mount."  After entering the correct password, the content will then be accessible on your OS via a virtual drive in the usual file manager method according to your OS (i.e., Finder, File Manager, Dolphin, Xfe, etc.).

Be sure to "dismount" the virtual drive and "eject" the removable media before removing physically from the machine.