I got the following error when I ran phrases.php as part of the upgrade.
Preparing to update database...
Error performing MySQL command: INSERT INTO rp_languages VALUES (1, 'english', 'en', 'UTF-8', 'ltr');
Error: Duplicate entry '1' for key 1
ReviewPost has been successfully installed!
I downloaded RP 5.1 last week. Can I ignore it? I had to run phrases.php more than once, as I forgot to remove single quotes in one of our text strings.