Upgrade path from Pods 1.12.4 to 2.3.8?

Here’s what I would do:

1. Backup Database and Files
2. Upgrade WordPress to latest (3.5.2)
3. Upgrade Pods to latest (2.3.8)
4. After the plugin upgrade, you’ll find a notice in your WP Admin area that Pods needs it’s own upgrade process ran, so follow the easy to use Upgrade Wizard it links to for that. You’ll notice there’s now a ‘Pods Admin’ menu at the bottom left of the admin menu, that’s where it’ll be if you don’t see the notice.
5. If you encounter any upgrade issues, don’t hesitate to reply to this thread and I’ll help you through them

A few good notes:

• Some code / database changes have occurred between Pods 1.x and Pods 2.x, if you have any hardcoded SQL queries, they will need to be adjusted.
• Pod Input helpers will no longer work, I’ll help you convert them individually for free if you need them, but Pods 2.x now includes many built-in options for fields that it’s rare custom inputs are ever needed.
• A full list of main changes between 1.x and 2.x can be found here, not all code changes are required, but it’s generally a good idea to update the code when you can so as to avoid issues down the line. We’ve worked hard at backwards compatibility, so most of your code should continue to work as is.