Well, here it is. It's an AutoIt script... it's been a long while since I used it... so normal disclaimer applies... if it nukes your computer, it's on you 
it's purpose back when it was (hastily) written was to uninstall the current spark, kill the %APPDATA/Spark directory, then download and install a fresh copy from our local server (using the Client Management plugin to host a local Spark download for our custom version).
you will surely need to customize parts... such as your server address, etc. Or, you can just modify it to only kill the %APPDATA%/Spark directory...
or, of course, either write your own script to do this... or just manually kill them.