Anybody experienced database not matching when upgrading P6 Rel. 8.3.2 to Rel. 8.4?

I have upgraded P6 from Rel. 8.3.2 to Rel. 8.4 but encountered login issue as follows:

Problem Summary

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P6 Rel. 8.4 Database does not match with Rel. 8.3.2

 

Problem Description

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When I logged in to P6 Release 8.4 (upgraded from P6 Release 8.3.2), I get an error message that "The application and dabase versions do not match." 

 

Expected database version: PPMDB, 0840.0001.0001

Current dabase version: PPMDB, 0820.0001.0001

I tried uninstalling Rel. 8.3 and installed Rel. 8.4, but the problem persisted.

Any solution is much appreciated.

Regards,

Dan