Version 1.6.42 Error – Will Not Activate

Hi, I am a longtime Form Manager Plugin user and it was working fine. I just got a notification that there was an update available so tried to update, but it would not Activate. I got the following message:

Plugin could not be activated because it triggered a fatal error.
Fatal error: Call to undefined method fm_db_class::DatabaseCheck() in /home/postpr7/public_html/aquariumcarebasics.com/wp-content/plugins/wordpress-form-manager/wordpress-form-manager.php on line 138

I deleted the plugin, and re-downloaded and installed it. When I tried to activate it, I got the same message again.

Thoughts?

Thanks!
Haz
http://www.aquariumcarebasics.com/

http://wordpress.org/plugins/wordpress-form-manager/