wb update problem

In the Impluse program there appears to be a discrepancy in update versions for windowblinds . It says the current installed version is 6.09g[b].135  and the update is version 6.09d[b].124...The update has a lower version number.  I did the update and when I restarted my computer, the activation window asked for my email address and activation.  The activation number was invalid, although I carefully put in the right number.  I did this twice and finally uninstalled windowblinds and reinstalled it through SDC.  Now the update version appears again in the impulse program.  I am reluctant to install the update since it still has a lower number than the one installed.  Has anyone else had this problem?  I would like to do the update, but I'm sure the same problem will arise again.