The Cost is "Free"

I could never understood how some website claimed to provide free downloads and yet asked you to pay a fee. So which part of "free" do I not get?

I always thought the word "free" meant there will be no money transaction involved. I checked it up on dictionary.com and there are apparently about 50 definitions for it and non of it suggests any monetary payment. For example:

free : /fri/ Pronunciation Key - Show Spelled Pronunciation[free] Pronunciation Key - Show IPA Pronunciation adjective, fre·er, fre·est, adverb, verb, freed, free·ing.
–adjective
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36. without cost, payment, or charge.
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So, I guess the internet has introduced it's own definition of "free" into our modern society huh. It's so frustrating and irritating...