I had never anticipated using this area for complaints but…
I recently bought "Perfect Photo Suite 5.5.1" from onOne software. In the past I've used their plugins for Photoshop and have been reasonably pleased with them. The suite was offered at a promotional price of $250 (half of the usual amount).
When installing the software it correctly identified my CS5 and put the plugins under Photoshop. I was astonished to find, however, that it insists on dumping >3GB of support files onto C: (in addition to the usual application data stuff). There is no option to alter this. I suppose I could try some registry hijinks, but why should I?
I contacted onOne support who very politely said, to paraphrase, "Yes, you're not the first to complain, sorry you don't like it we apologize." I happen not to allow application software on my boot drive, so that response is not good enough for me. At this price point, with previous complaints, I'd expect some action other than "Oh dear, sorry." How hard can it be to create a sensible installer?
We'll see what happens next as I've asked for a refund.