OK, to be on the safe side, please try open one of the photos in Tropy (if you select the item and you see an exclamation mark icon next to the photo in the photo panel, you're good to go) and then upload the
project.log file here (please just upload the file itself, not a screenshot, because I will have to take a look inside to see the path).
Alternatively, you can send me your project file (you can send it to email@example.com if you would rather not share it here), then I can take a look at the paths there.
We also need to determine the paths on your new computer: just select the folder containing your photos in Finder and press Cmd+i -- this should display more information about the folder including the full location (under 'Where' in the 'General' section). Please post that information here (or a screenshot) then I can change the paths in your project accordingly.