I've been installing BIAB on top of itself since version 8 and never had a problem with that (well, one time, but it turned out to be something else on my computer that PGMusic helped me identify and fix). That would be version 8, 9, 10, 11, 12, 2004, 2005, 2006, 2007, 2007.5, 2008, 2008.5, 2009, 2009.5, 2010, 2010.5, 2011, 2011.5, 2012, 2012.5, 2013, and 2014.

So, yes, I would definitely upgrade on top of the previous version. All the add-ons stay put, all the changed files get updated, and all the new files get installed.

But, as I've said before, I always do a backup of my BIAB folder before doing the upgrade, so that if something goes wrong, it's quick and easy to get back to where I before starting the update. That is one of the huge advantages of BIAB NOT writing everything it needs to the registry.

John

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