I ordered CrazyRhythm through KVR 8 days ago. Evil Turtle Productions were supposed to send an email with download instructions, but despite further queries to their support email, they haven't responded in any way. KVR has been in touch with me and I have no issues at all with KVR. Whatever is up with the person or people running Evil Turtle Productions however, I'd suggest that people avoid this product until the issue is resolved.
[Updated 4th September 2020. The day after posting the above review (which at the time I gave one star to], I received a link to the product. No explanation was given for the delay. I installed it and tried it out, and I'm perfectly happy with it. It pretty much does what it is described as doing, so I have nothing to add beyond it being straightforward to install and use, and potentially a lot of fun.
I then contacted the seller again, the same day, to say that I would be updating this review and to see if they wanted to add anything. I sent that email to both the support and sales emails. Since then, I've heard nothing.
I've updated the product version in the review window from 'n/a' (because I had no product) to 'unknown' because I can't find a product version, even in the .exe file details panel.
The bottom line is that support seems to be non-existent. If you buy it, you might be able to download it eventually or you might not. If you do, you will have a good product to play with, but if you have any questions, you'll be on your own. Sad.].