I don't think there is a limit of downloads. On my old desktop, I did major renovations and re-installed Vcarve at least a couple of times. That PC went up in smoke, so I finally got a new one. Another fresh install. I'm also on my second laptop with at least one fresh install on each. In all, I still have only two running PCs with Vcarve 9 installed, a desktop and a laptop. Lots of downloads, though. No problems.