I have ..... I had nothing but trouble with the online store that processed the upgrade of zBrush v1.55b to v2. Headaches and stuff-ups galore, and umpteen international calls to the USA and Germany. Having said that, I must add that the zBrush tech rep (Matthew) was more than helpful throughout the process. I recently bought a brand new PC, and have had similar difficulties so far with installing zBrush v2 again. Oh well, I'll take a deep breath and plunge in again...aaaarrrggh..