I have just upgraded to 1.4.5.1 via upgrade instructions.
The setup is not recognizing the zenphoto.cfg in the data directory. It is there, spelled as above and configured correctly, but I keep getting the error message:
Setup was not able to create this file. You will need to copy the zp-core/zenphoto_cfg.txt file to zp-data/zenphoto.cfg then edit it as indicated in the file's comments.
Perhaps it's a permission setting?