The ASLU "Super-USB" includes all four levels of Instructional videos (lessons 1 through 60) in ".mp4" format. Also includes lesson pages and quizzes for lessons 1 through 30 which covers ASL 1 and 2.
The Super-USB is a big collection of various ASL resources in various states of functionality but I think you'll like it. When it arrives just double click on the "index" file (or the start file -- either one) and it should open up in your browser. It doesn't require internet access but much of it "was" online at one point in time so if you hit a link that tries to jump online you can just click the back button and explore some other aspect of the Super-USB resources.
It works on both PC and Apple computers because it is based on the Lifeprint.com website and other ASLU online resources in formats that most computers can make use of.
Super-USB
Specific format, color, and packaging of this product may vary depending on market pricing for blank USB drives but in general at the time of this writing the Super-USB consists of a 64-GB size thumb drive with a standard type-A connector.