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You upgraded allready by uploading the 2.3.2b upgrade folder. The /upgrade page tells you that uploading is enough and no further steps are nescessary.
But to be sure. What tells the page you get when you enter the administration section? The first line must tell you that you are using XOOPS 2.3.2 That you actually use version 2.3.2b is not shown. Not a good thing by the way...