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What is the recommended procedure for upgrading from 9.1 to 9.3?

We are running xTuple 4.4.0.  We installed 9.3 on a new Windows 8 box and then restored a backup from 9.1.  After restoring the database we tried to login with the 4.4.0 client but we are getting an error that the "procpid" column doesn't exist (see incident 21852),