Hoping I'm not too late Alan...but to upgrade over that much, you'll pass through P53 which is a "Major Update". After the restart, you'll need to re-enter some configuration settings. Apart from communication rates you'll need to re-enter some Wunderground settings (WMO codes I think it was).
No, not too late. I shall leave it until I have to restart my computer after my next Windows update, thanks for the info. Out of interest, is P53 much improved on earlier versions of VWS? I probably wouldn't have bothered upgrading from 13, but as you know the WMR 200 wasn't supported on earlier versions.