You open a box you got from your new Adobe subscription and inside it's the Adobe Flashing-Learnesty Tree. It comes with batteries and on the side of it, there is a USB port, and the box also contained a USB. The Adobe Flashing-Learnesty Tree only turns on when there is a USB with the correct files.

The usb contained ASL lessons.

You can buy AF-LT (Adobe Flashing-Learnesty Tree) USB drives online