I’ve been in your position. All your projects are in the database file, nm_scriptcase.db, under the scriptcase\devel\conf\scriptcase folder.
I’m not sure about if supporting files like images, templates, etc., are stored in the DB file too. But you could try this:
Install Scriptcase in a new disk or PC. Migrate your license to the new installation (you can do this in the Scriptcase site, you will receive a new serial number and the old one will be invalidated), and then replace the nm_scriptcase.db file with your backed up file.
Let us know how it goes!