Software Installation and Permanent Changes Permanent changes and software installations can only be made to a Thawed computer, a Thawed volume, or a ThawSpace on the computer. If a computer is in a Frozen state, any software that has been installed will be gone after a restart. A newly installed application should be run at least once while the computer or volume is Thawed in order to create a preference file, dismiss registration dialogs, and initialize various values. A newly installed application may require the computer to be restarted for setup to be completed. If this is the case, it is recommended to restart the computer in a Thawed state, and then log in with the same user account, run the application once, and then log out before setting the computer to restart in a Frozen state.