Why does Omni Tools still show the old version after attempting to upgrade to v9.00?
Version 9.00 of Dexterity introduced more complex version checking for the including of Dexterity Chunks. These checks prevent a chunk file from one version extracting into a system which already has a dictionary of a different version. So, attempting to install the v9.00 chunk on top of a v8.0 dictionary will fail.
The solution is to delete the OMNITOOL.DIC and/or OMNIPRCE.DIC file and re-install the v9.00 chunks. They will install successfully now.