ODeL study here is not a set of files on a website. Each unit is built for distance: short lessons, a live class every week, practice you can do offline, and an assessment marked against a rubric.
With low-data mode on, a lesson costs a few megabytes and a whole unit downloads as a pack you can study with no connection at all.
Every trainee has a trainer who answers questions, a help desk open 8am to 8pm, Monday to Saturday, and results released within days of marking.