Hello Alex_Tidd,
Parallels Desktop 6 for Mac is not compatible with Mac OS X 10.9.5. Parallels Desktop 9 with the latest build 9.0.24251 and Parallels Desktop 10 are compatible with Mac OS X 10.9.5.
Upgrade to Parallels Desktop 10 for Mac is only supported from the following versions:
- Parallels Desktop 9 for Mac
- Parallels Desktop 9 for Mac Upgrade
- Parallels Desktop 8 for Mac
- Parallels Desktop 8 for Mac Upgrade
If your previous version is Parallels Desktop 7 or earlier, you should buy a full license of Parallels Desktop 10 for Mac.
Removing or un-installing Parallels Desktop 6 doesn't affect your Virtual Machine. The Virtual Machine files ( .pvm file ) including the virtual hard disk (.hdd ) will still be there without any change on your Mac. The .pvm file ( Parallels Virtual Machine file ) will not be removed automatically until you remove it manually from your Mac.
The default location of the .pvm file will be in ~ Documents/Parallels folder > .pvm or in /Users/Shared/Parallels folder > .pvm
Please let us know if you have any questions, we are here to help you.
Last edited: Sep 26, 2014