I am a registered OE user, but I don't remember if this was the email address I used.
You may also try export to EXE file which should be the most compatible way for offline browsing - it contains part of Offline Explorer browser and server to emulate online environment.
It will only be downloaded in Browse with Autosave. After typing the above address a menu with Lesson 1, lesson 2, lesson 3...select one, then click start learning
after a little wait a video plays, at the top, switch between instruction, vocabulary, sentence pattern...in browse autosave they will be downloaded, click menu at lower right to return to the menu lessons.
After downloading a few videos you might try Exporting.
I would like to try your suggestion but in OE it is greyed out, I cannot select that option, only Folder on a disk and ZIP archive can be selected.
It looks like the Flash applet allows itself only in online environment and EXE file emulates that properly.