Maybe not - I don't work for stardock, i've just been using WB 3yrs and can access (via SDC) the history files.
the 5.1 release should be:
Wblind.dll 2006/10/09 10:24:20
Wblind64.dll 2006/10/09 11:51:37
Wbsrv.dll 2006/10/09 10:40:18
Wbconfig.exe 2006/10/10 16:39:13
Wbload.exe 2006/03/13 17:54:14
Wbhelp.dll 2004/09/18 16:37:07
Wbui.dll 2005/12/06 21:29:06
Tray.dll 2006/04/13 17:29:23
hours fluctuate based on your location and the server's - but the dates don't
From personal experience, I think you're better off uninstalling, rebooting, getting Stardock Central, register in SDC, then use it to download/install - SDC will also alert you to any updates you may be entitled to.
or just try updating via SDC after entering your serial - register is under tools
Stardock Central