For new installations:
  touch ${MY_INSTALLDIR}/.htaccess ${MY_INSTALLDIR}/config.php
  chown ${VHOST_SERVER_GID}:${VHOST_SERVER_UID} ${MY_INSTALLDIR}/.htaccess ${MY_INSTALLDIR}/config.php

Then create an albums directory and set permissions, e.g.,
 chown ${VHOST_SERVER_GID}:${VHOST_SERVER_UID} my_albums_directory

Now, point your browser to http://${VHOST_HOSTNAME}/${VHOST_APPDIR}/setup/
and follow the instructions.