Are you on Mac OS X?
I guess yes.
If this is the case you have to delete the followong folders:
/Library/Arturia/Spark
/Library/Audio/Plug-Ins/VST/Spark.vst
/Library/Audio/Plug-Ins/Components/Spark.component
/Library/Application Support/Digidesign/Plug-Ins/Spark.dpm
/Application/Arturia/Spark.app
/Application/Arturia/Spark MIDI control Center.app
I advise you to install directly the latest
update from our website.