Note on Upgrading from IUM 7.1.x to IUM 7.2.x

Infinite User Management 7.2.x contains a change to the IUM database schema (structure).  When upgrading from IUM 7.1.x to 7.2.x, you'll receive a warning that the upgrade cannot be reversed.  This is because 7.2.x contains a change to the database schema.  Reverting to 7.1.x after upgrading the IUM database to 7.2.x will cause database errors.  If you need to downgrade to 7.1.x, you'll need to create a new database.
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