I had a working CCSV5 installation, but when I tried to update it, the process hung, leaving me with a corrupted installation which always complained about errors. I tried to install v5.3 instead, but that complains about a MacAfee firewall (I only have MacAfee virus scanner). I tried to uninstall everything and start again with v5.1, but that has stalled at: "Installing idecore_setup_5.1.0.N201110281600.exe executable"