New exception if uninstall fails but cask is installed

lib/hbc/cask.rb

@@ -75,6 +75,10 @@ def installed?
     staged_path.exist?
   end
 
+  def installed_at_all?
+    caskroom_path.exist?
+  end
+
   def to_s
     @token
   end

lib/hbc/cli/uninstall.rb

@@ -6,7 +6,13 @@ def self.run(*args)
     cask_tokens.each do |cask_token|
       odebug "Uninstalling Cask #{cask_token}"
       cask = Hbc.load(cask_token)
-      raise Hbc::CaskNotInstalledError.new(cask) unless cask.installed? or force
+      if !cask.installed? and !force
+        if cask.installed_at_all?
+          raise Hbc::CaskUninstallVersionError.new(cask)
+        else 
+          raise Hbc::CaskNotInstalledError.new(cask)
+        end
+      end
       Hbc::Installer.new(cask).uninstall(force)
     end
   end

lib/hbc/exceptions.rb

@@ -11,6 +11,17 @@ def to_s
   end
 end
 
+class Hbc::CaskUninstallVersionError < Hbc::CaskError
+  attr_reader :token
+  def initialize(token)
+    @token = token
+  end
+
+  def to_s
+    "#{token} has an updated version, use uninstall --force to remove"
+  end
+end
+
 class Hbc::CaskUnavailableError < Hbc::CaskError
   attr_reader :token
   def initialize(token)