I think the best solution would be to assign a permanent drive letter to your USB drive; on Windows 10 you can do this using the Disk Management utility. If you do this on both your computers the paths to your photos will be identical. Once that’s done, we need to change the paths in your Tropy project. To do this you’ll have to install SQLite which, unfortunately, is not pre-installed on Windows, so, if you prefer, just send me the project file at sylvester.keil@gmail.com — I can quickly update the drive letter of all the photo paths for you (just let me know which drive letter you picked!).