With mowes and opensim console running (but no viewer open/avatar inworld) locate and run:
and when prompted, enter y to copy over the wifi admin panel settings (not sure if this is needed or not, but seemed sensible to do)
this will update to the latest version of the distro.
NB: The newest version is installed into a new diva-rxxxx folder. With the latest version, there is no separate file to run for 32-bit / 64-bit .. both use OpenSim.exe
Once updated, run diva-rxxxxx>bin>OpenSim.exe
(make sure you choose the newer folder of diva-rxxxxx!!)
and then login to your virtual world as normal.