When attempting to install software to a ThawSpace on OSX you may see an error that the installer cannot install to the ThawSpace because the volume is disabled. This is due to a restriction in the installer application that prevents it from installing software to destinations other than your boot volume.
To work around this you can run the following commands from a command prompt to install your software, replacing the name of the package file with the one that you are installing:
/usr/sbin/installer -pkg "softwaretoinstall.pkg" -target "/Volumes/THAWSPACE/"
This will override the restriction that prevents you from installing to a partition other than the one that you have booted from.