FYI, in case you didn't know this yet and to whom it may concern, because freezing doesn't seem to be very popular amongst FDISR-users. "Freeze Snapshot" acts also as an "update" of a frozen snapshot. For instance, if you want to change a setting in a software and you want to keep it. 1. Boot in the frozen snapshot. 2. Make the changes. 3. Freeze the snapshot again. 4. Reboot in the frozen snapshot as recommended by FDISR. The changes are kept in the frozen snapshot. So you don't need to "unfreeze" the frozen snapshot. I assume that this also works for adding new softwares to a frozen snapshot. If the new software requires a reboot right after installation, you have to "disable Pre-boot" first otherwise the new software will disappear.