To restore a backup using this software, you need to install the software on the computer and locate the folder that contains the BookDB.exe file. After this is done, you simply need to copy the backed-up data into that folder. If you run the program after the installation, it is possible that there are some files with the same name as your backed-up files in the folder. If you need these files (the new ones that were made after the fresh installation) copy them somewhere else, if not just overwrite them. This should solve your problem.