GOG.com version: how to update to Rivals 2.1

Hello-

I own the GOG.com version of Sorcerer King: Rivals. I was gratified to discover that I was not missing the campaign expected to be released in SK:R, but in fact could expect to see it in the release of update 2.1.

I checked the GOG.com web site, and it does have version 2.102 available for downloading. However, unlike most updates from there- which are typically labeled as GOG version x- the new update for 2.1 is marked as version 2.102 (2 files). Moreover, only the full game is available for downloading, rather than a patch to update my current installation to 2.1.

As such, I was wondering how best to update my game. Is it possible to simply install over my current game- or would I be better off uninstalling, then reinstalling?

Any insight would be greatly appreciated.