Downgrade from Omeka 2.0 to 1.5

I have upgraded from 1.5 to 2.0 without checking thoroughly if all essential plugins to my site are upgraded. Regretfully. Contribute plugin has not been made to work with Omeka 2.0 which really kills an important element of the site. So I want to downgrade back to 1.5. IT seems that the Database is the problem. Does anyone know how I can downgrade?

The bad news is that if you do not have a backup of the database to restore from, there's not really a downgrade path.

The good news is that an upgraded Contribute should be ready in a week or two.

Is there any update on the upgraded Contribute plugin?

We've been devoting lots of time to over the past weeks (and will be over the next weeks), but I hesitate to make estimates about when it will be officially released.