diff --git a/Casks/adobe-cs6-design-standard.rb b/Casks/adobe-cs6-design-standard.rb
index 400353a03..87b73b682 100644
--- a/Casks/adobe-cs6-design-standard.rb
+++ b/Casks/adobe-cs6-design-standard.rb
@@ -19,6 +19,12 @@ cask 'adobe-cs6-design-standard' do
   # and https://github.com/caskroom/homebrew-versions/pull/296
 
   preflight do
+    processes = system_command '/bin/launchctl', args: ['list']
+
+    if processes.stdout.lines.any? { |line| line =~ %r{^\d+\t\d\tcom.apple.SafariNotificationAgent$} }
+      system_command '/usr/bin/killall', args: ['-kill', 'SafariNotificationAgent']
+    end
+
     language = case MacOS.language
                when %r{^de} then 'de_DE'
                when 'en-GB' then 'en_GB'
@@ -31,8 +37,6 @@ cask 'adobe-cs6-design-standard' do
                  'en_US'
                end
 
-    system_command '/usr/bin/killall',
-                   args: ['-kill', 'SafariNotificationAgent']
     system_command "#{staged_path}/Adobe CS6 Design Standard/Install.app/Contents/MacOS/Install",
                    args: [
                            '--mode=silent', "--deploymentFile=#{staged_path}/Adobe CS6 Design Standard/deploy/install-#{language}.xml"
@@ -43,8 +47,12 @@ cask 'adobe-cs6-design-standard' do
   end
 
   uninstall_preflight do
-    system_command '/usr/bin/killall',
-                   args: ['-kill', 'SafariNotificationAgent']
+    processes = system_command '/bin/launchctl', args: ['list']
+
+    if processes.stdout.lines.any? { |line| line =~ %r{^\d+\t\d\tcom.apple.SafariNotificationAgent$} }
+      system_command '/usr/bin/killall', args: ['-kill', 'SafariNotificationAgent']
+    end
+
     system_command "#{staged_path}/Adobe CS6 Design Standard/Install.app/Contents/MacOS/Install",
                    args: [
                            '--mode=silent', "--deploymentFile=#{staged_path}/uninstall.xml"
diff --git a/Casks/adobe-cs6-design-web-premium.rb b/Casks/adobe-cs6-design-web-premium.rb
index 0185446b9..be557e611 100644
--- a/Casks/adobe-cs6-design-web-premium.rb
+++ b/Casks/adobe-cs6-design-web-premium.rb
@@ -19,6 +19,12 @@ cask 'adobe-cs6-design-web-premium' do
   # and https://github.com/caskroom/homebrew-versions/pull/296
 
   preflight do
+    processes = system_command '/bin/launchctl', args: ['list']
+
+    if processes.stdout.lines.any? { |line| line =~ %r{^\d+\t\d\tcom.apple.SafariNotificationAgent$} }
+      system_command '/usr/bin/killall', args: ['-kill', 'SafariNotificationAgent']
+    end
+
     language = case MacOS.language
                when %r{^de} then 'de_DE'
                when 'en-GB' then 'en_GB'
@@ -31,8 +37,6 @@ cask 'adobe-cs6-design-web-premium' do
                  'en_US'
                end
 
-    system_command '/usr/bin/killall',
-                   args: ['-kill', 'SafariNotificationAgent']
     system_command "#{staged_path}/Adobe CS6 Design and Web Premium/Install.app/Contents/MacOS/Install",
                    args: [
                            '--mode=silent', "--deploymentFile=#{staged_path}/Adobe CS6 Design and Web Premium/deploy/install-#{language}.xml"
@@ -43,8 +47,12 @@ cask 'adobe-cs6-design-web-premium' do
   end
 
   uninstall_preflight do
-    system_command '/usr/bin/killall',
-                   args: ['-kill', 'SafariNotificationAgent']
+    processes = system_command '/bin/launchctl', args: ['list']
+
+    if processes.stdout.lines.any? { |line| line =~ %r{^\d+\t\d\tcom.apple.SafariNotificationAgent$} }
+      system_command '/usr/bin/killall', args: ['-kill', 'SafariNotificationAgent']
+    end
+
     system_command "#{staged_path}/Adobe CS6 Design and Web Premium/Install.app/Contents/MacOS/Install",
                    args: [
                            '--mode=silent', "--deploymentFile=#{staged_path}/uninstall.xml"
diff --git a/Casks/adobe-cs6-master-collection.rb b/Casks/adobe-cs6-master-collection.rb
index f60c21a94..63165b658 100644
--- a/Casks/adobe-cs6-master-collection.rb
+++ b/Casks/adobe-cs6-master-collection.rb
@@ -19,6 +19,12 @@ cask 'adobe-cs6-master-collection' do
   # and https://github.com/caskroom/homebrew-versions/pull/296
 
   preflight do
+    processes = system_command '/bin/launchctl', args: ['list']
+
+    if processes.stdout.lines.any? { |line| line =~ %r{^\d+\t\d\tcom.apple.SafariNotificationAgent$} }
+      system_command '/usr/bin/killall', args: ['-kill', 'SafariNotificationAgent']
+    end
+
     language = case MacOS.language
                when %r{^de} then 'de_DE'
                when 'en-GB' then 'en_GB'
@@ -31,8 +37,6 @@ cask 'adobe-cs6-master-collection' do
                  'en_US'
                end
 
-    system_command '/usr/bin/killall',
-                   args: ['-kill', 'SafariNotificationAgent']
     system_command "#{staged_path}/Adobe CS6 Master Collection/Install.app/Contents/MacOS/Install",
                    args: [
                            '--mode=silent', "--deploymentFile=#{staged_path}/Adobe CS6 Master Collection/deploy/install-#{language}.xml"
@@ -43,8 +47,12 @@ cask 'adobe-cs6-master-collection' do
   end
 
   uninstall_preflight do
-    system_command '/usr/bin/killall',
-                   args: ['-kill', 'SafariNotificationAgent']
+    processes = system_command '/bin/launchctl', args: ['list']
+
+    if processes.stdout.lines.any? { |line| line =~ %r{^\d+\t\d\tcom.apple.SafariNotificationAgent$} }
+      system_command '/usr/bin/killall', args: ['-kill', 'SafariNotificationAgent']
+    end
+
     system_command "#{staged_path}/Adobe CS6 Master Collection/Install.app/Contents/MacOS/Install",
                    args: [
                            '--mode=silent', "--deploymentFile=#{staged_path}/Adobe CS6 Master Collection/deploy/uninstall-en_US.xml"
diff --git a/Casks/adobe-cs6-production-premium.rb b/Casks/adobe-cs6-production-premium.rb
index d9b7d82f2..34f6facff 100644
--- a/Casks/adobe-cs6-production-premium.rb
+++ b/Casks/adobe-cs6-production-premium.rb
@@ -19,6 +19,12 @@ cask 'adobe-cs6-production-premium' do
   # and https://github.com/caskroom/homebrew-versions/pull/296
 
   preflight do
+    processes = system_command '/bin/launchctl', args: ['list']
+
+    if processes.stdout.lines.any? { |line| line =~ %r{^\d+\t\d\tcom.apple.SafariNotificationAgent$} }
+      system_command '/usr/bin/killall', args: ['-kill', 'SafariNotificationAgent']
+    end
+
     language = case MacOS.language
                when %r{^de} then 'de_DE'
                when 'en-GB' then 'en_GB'
@@ -31,8 +37,6 @@ cask 'adobe-cs6-production-premium' do
                  'en_US'
                end
 
-    system_command '/usr/bin/killall',
-                   args: ['-kill', 'SafariNotificationAgent']
     system_command "#{staged_path}/Adobe CS6 Production Premium/Install.app/Contents/MacOS/Install",
                    args: [
                            '--mode=silent', "--deploymentFile=#{staged_path}/Adobe CS6 Production Premium/deploy/install-#{language}.xml"
@@ -43,8 +47,12 @@ cask 'adobe-cs6-production-premium' do
   end
 
   uninstall_preflight do
-    system_command '/usr/bin/killall',
-                   args: ['-kill', 'SafariNotificationAgent']
+    processes = system_command '/bin/launchctl', args: ['list']
+
+    if processes.stdout.lines.any? { |line| line =~ %r{^\d+\t\d\tcom.apple.SafariNotificationAgent$} }
+      system_command '/usr/bin/killall', args: ['-kill', 'SafariNotificationAgent']
+    end
+
     system_command "#{staged_path}/Adobe CS6 Production Premium/Install.app/Contents/MacOS/Install",
                    args: [
                            '--mode=silent', "--deploymentFile=#{staged_path}/uninstall.xml"