as for updating via component manager, there are two schools of thought on this one.
some people always uninstall the old version before installing the new version.
others simply make sure that the old version isnt running before installing over the top of it.
as far as i can tell it doesnt normally make much difference. although, having said that unistalling and reinstalling can wipe out any settings you have made.
the WB you had to install over was a special case because there was a bug in the uninstaller where it would uninstall ALL installed skins along with the program
as for the weather, perhaps you need to take a different perspective on the rain.
when you come in from outside as a wet cat your well trained humans should imediately leap forward with a big fluffy towel and then spend at least 10 minutes rubbing you all over to dry you off, smooth down the spikey fur, and giving you a good tummy rub