There are two people on the P.W.I.A.-wiki, who report that the Internet Max option is no longer available:
I'm afraid it didn't work for me :-/ - Prepaid Wireless Internet Access
Also
Orange's website doesn't mention the "Internet Max" in the "bons plans" section anymore. There's only a "Option journée Internet max", which is a day-based flatrate valid from 02:00h until 23:59h.
Have Orange really abolished the monthly Internet max option? And why has the "Option journée Internet max" a gap of 2 hours after midnight? That hole seems to be intended to rip off customers, who erroneously assume there would be a 24h-billing period.