To retrieve the lost Book 1 in Regi Dean's Recipes program, you can try the following steps:
1. Open the program and navigate to the file menu or settings.
2. Look for an option to import or restore a backup file.
3. If you have a backup of Book 1, locate and select that file to restore it.
4. If you don't have a backup, check if there is an option to browse or search for files within the program. Locate the file that contains Book 1 and select it.
5. Once Book 1 is restored, you can proceed to update the file to the latest version. Check for any available updates within the program or visit the program's official website for more information.
Hope this helps!