I've updated from 1.3 to 1.3.2 using the files in punbb-1.3_to_1.3.2-changed_files.zip
After uploading the files the forum stop working showing this message:
"Your PunBB database is out-of-date and must be upgraded in order to continue. Please run db_update.php in order to complete the upgrade process."
I had to edit the config table in the database and delete the cache files, none on this were on a README or any file in the zip package.
Another weird thing is that the link to the db_update.php script was exposed to every visitor! anyone could click on that and start the upgrade process. I don't know if this is normal but it looked weird to me