If you simply cannot afford the course, consider open-source alternatives like (free, public domain) or Lawless French (free online lessons), though they use a very different method.
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Assimil French with Ease course is a widely respected "natural method" program designed to take learners from beginner to an intermediate level. While unofficial PDF versions circulate online, the legitimate course is typically sold as a book with accompanying audio recordings. The Assimil Methodology assimil frances pdf verified