On apps where the is a free version and a paid version, you usually have to uninstall the free version. This is probably the case with scetchbook, but I only ever got the paid version. I usually do this before I install the paid version as occasionally you can't tell the difference (LightFlow comes to mind).
On apps where you buy a key to unlock paid functionality in the app, just download and install the key and continue to use the app (this is how Rom Manager works).
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