diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index bd4959e6..c273ce1c 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -8,21 +8,21 @@
 
 # Offense count: 11
 Metrics/AbcSize:
-  Max: 39
+  Max: 44
 
 # Offense count: 1
 # Configuration parameters: CountComments.
 Metrics/ClassLength:
-  Max: 226
+  Max: 260
 
 # Offense count: 3
 Metrics/CyclomaticComplexity:
-  Max: 8
+  Max: 10
 
 # Offense count: 10
 # Configuration parameters: CountComments.
 Metrics/MethodLength:
-  Max: 40
+  Max: 51
 
 # Offense count: 1
 # Configuration parameters: CountKeywordArgs.
@@ -31,4 +31,4 @@ Metrics/ParameterLists:
 
 # Offense count: 2
 Metrics/PerceivedComplexity:
-  Max: 9
+  Max: 12
diff --git a/README.md b/README.md
index c54e16bb..971533e9 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ Install and update your Xcodes automatically.
 
 ```
 $ gem install xcode-install
-$ xcversion install 6.3
+$ xcversion install 8
 ```
 
 ## Installation
@@ -35,15 +35,18 @@ XCODE_INSTALL_USER
 XCODE_INSTALL_PASSWORD
 ```
 
+or 
+
+```
+FASTLANE_USER
+FASTLANE_PASSWORD
+```
+
 To list available versions:
 
 ```
 $ xcversion list
-6.0.1
-6.1
-6.1.1
-6.2
-6.3
+8
 ```
 
 Installed versions will be omitted and by default, only the latest major version is listed.
@@ -57,12 +60,12 @@ To install a certain version, simply:
 
 ```
 $ xcversion install 8
-###########################################################               82.1%
 ######################################################################## 100.0%
-Please authenticate for Xcode installation...
+/Applications/Xcode-8.app: accepted
+source=Apple System
 
-Xcode 8
-Build version 6D570
+Xcode 8.0
+Build version 8A218a
 ```
 
 This will download and install that version of Xcode. It will also be automatically selected.
diff --git a/lib/xcode/install.rb b/lib/xcode/install.rb
index c013b98e..f6734f00 100644
--- a/lib/xcode/install.rb
+++ b/lib/xcode/install.rb
@@ -48,6 +48,20 @@ def current_symlink
       File.symlink?(SYMLINK_PATH) ? SYMLINK_PATH : nil
     end
 
+    def os_version_compatibility_issue?(version)
+      #Xcode 8 requires 10.11.5+ to extract the .xip
+      #Extracting the Xcode .xip with < 10.11.5 returns  this  error `cpio read error: Undefined error: 0`
+      return false if version != '8'
+
+      osx_version = `sw_vers -productVersion`.delete!("\n")
+      version_parts = osx_version.split('.')
+
+      minor = version_parts[1].to_i
+      patch = version_parts[2].to_i
+
+      return true if minor < 12 && minor < 11 || minor == 11 && patch < 5
+    end
+
     def download(version, progress, url = nil)
       return unless url || exist?(version)
       xcode = seedlist.find { |x| x.name == version } unless url
@@ -107,7 +121,6 @@ def install_dmg(dmg_path, suffix = '', switch = true, clean = true)
           $stderr.puts out.tr("\n", ' ')
           return
         end
-
         `sudo -p "#{prompt}" ditto "#{source}" "#{xcode_path}"`
         `umount "/Volumes/Xcode"`
       end
diff --git a/lib/xcode/install/install.rb b/lib/xcode/install/install.rb
index fc2bce33..946f875c 100644
--- a/lib/xcode/install/install.rb
+++ b/lib/xcode/install/install.rb
@@ -35,6 +35,7 @@ def validate!
         super
 
         help! 'A VERSION argument is required.' unless @version
+        fail Informative, 'An OS X version >10.11.4 is required for Xcode 8.' if @installer.os_version_compatibility_issue?(@version)
         fail Informative, "Version #{@version} already installed." if @installer.installed?(@version) && !@force
         fail Informative, "Version #{@version} doesn't exist." unless @url || @installer.exist?(@version)
         fail Informative, "Invalid URL: `#{@url}`" unless !@url || @url =~ /\A#{URI.regexp}\z/