To uninstall the old Spellbreak Launcher, use Windows “Add or Remove Programs” feature of Windows to find the Spellbreak application and choose “Uninstall.”
Unfortunately, this may not remove all of the files used by Spellbreak. You may need to delete the Spellbreak folder manually. The default location for the Spellbreak folder is C:\Program Files (x86)\Spellbreak. After uninstalling Spellbreak, you may delete that entire folder and its contents.