Uninstalling previous SketchData extensions...

Recent updates to the SketchData Toolbar requires the uninstalling
of any older versions of the extension before installing the latest
extension otherwise you will see the SketchData menu entry twice.

Delete the following Files and Folders from the SketchUp Plugins folder location.

sd_dcfunctions.rbs (File)
sd_loadsketchdata.rb (File)
sd_sketchdata (Folder)

Extension location for Windows Operating Systems

SketchUp Version 8
C:\Program Files\Google\Google SketchUp 8\Plugins

SketchUp 2013
C:\Program Files\SketchUp\SketchUp 2013\Plugins

SketchUp 2014
C:\Users\\AppData\Roaming\SketchUp\SketchUp 2014\SketchUp\Plugins

Extension location for Mac Operating Systems

/Users//Library/Application Support/SketchUp [n]/SketchUp/Plugins