Test the new release

Perform any additional testing as appropriate to ensure the new version does not introduce any regressions.

Switch the site to the new version

The commands below should be executed from the web root (or wherever the mantisbt scripts are installed) and assume that the "live" directory (old version) is named mantisbt and the new release directory is mantisbt-1.3.x.

mv mantisbt mantisbt-old
mv mantisbt-1.3.x mantisbt

Put the site back on line

rm mantis_offline.php

This should be the final step in the upgrade process, as it will let users login again.