The July 2017 PC Pro magazine (UK), the leading PC user magazine, has a free copy of CrazyTalk Animator 2 SE. As far as I can tell from the features grid, it’s the same as CTA 2 Standard except you can’t output high-res frames. CTA is currently at version 3.1.
CTA is an excellent intro to 2D animation, and especially so for bright kids, without all the hang-ups of pro-level animation software. Even less able kids could use it, to make static comic-strips for the Web — for which you don’t need high-res output.