To install, you can run:
IEVMS_VERSIONS="7 8 9 10 11" ./ievms.sh
If you abort your install or need to reinstall, there are a few places to check:
1. Go to File -> Virtual Media Manager. Remove any of the .vmdk that you are trying to install.
2. Remove the .vbox file ( i.e. /Users/johnsmith/VirtualBox VMs/IE8 - WinXP/IE8 - WinXP.vbox)
3. Remove the ~/.ievms directory.
This PR enhancement should helpfully improve the checking of incomplete downloads: