To update the whole bundle all you have to do is extract the zip file in a new place (and usually in the same place). How is that harder than mucking around with individual folders? If you have bookmarks or preferences that you want to keep, 1. You should be storing TBB on an encrypted volume 2. You shouldn't be changing the defaults too much because that reduces your anonymity 3. There are only a couple files that you need. Go to Data\profile and copy over places.sqlite and prefs.js