If during the upgrade to int_meta-6.x-1.0-beta2 you encounter:

user warning: You have an error in your SQL syntax;
check the manual that corresponds to your MySQL server version for the right syntax
to use near 'NOT NULL' at line 1 query:
   ALTER TABLE int_meta_fields ALTER combine SET NOT NULL ... 

Enter the following query into mySQL using whatever tool is available to you (I use the command line MySQL utility). Adjust as appropriate to your environment.

use {database-name};
ALTER TABLE int_meta_fields MODIFY combine int(11) NOT NULL;

Bring your site out of maintenance mode, you did do the upgrade while in maintenance mode right?, and you should be all set,