I agree, this is very badly phrased for git. It refers to the version of git we're selling, which only really makes sense as soon as we start to provide our own downloads (soon…).
To be accurate, it's badly phrased for most products. You (effectively) can't use software unless you're licensed to do so. Every app you ship that an end user can use must therefore be licensed. Most open source licenses contain clauses that the version that you're delivering (either for free or charging for it) retain the original license conditions.
Which license does this notice message refer to? This is completely wrong!