diff --git a/ChangeLog.md b/ChangeLog.md
new file mode 100644
index 0000000..ba7b4db
--- /dev/null
+++ b/ChangeLog.md
@@ -0,0 +1,18 @@
+# ChangeLog
+
+* __next version__ - XXXX-XX-XX
+
+- TBA
+
+* __1.1.0__ - 2018-06-06
+
+- Added md5 hash check to verify downloaded contents (#8)
+- Changed download links to point to projects GitHub Release Page (#1)
+
+* __1.0.0__ - 2018-03-23
+
+- Signed GUI Installer for OS X El Capitan 10.11 - macOS High Sierra 10.13 that establishes the compilation toolchain for _R_.
+- Detects, downloads, and installs the appropriate Xcode CLI and gfortran installers for supported macOS systems.
+- Downloads and installs the `clang4` CRAN binary.
+- Sets the proper paths for `CC`, `CXX`, `CXX**`, `FLIBS`, and `LDFLAGS` in the `~/.R/Makevars file`.
+- **Financial support was provided to sign the installer by [Professor Timothy Bates](http://www.ed.ac.uk/profile/timothy-bates) of the [University of Edinburgh](http://www.ed.ac.uk/).**
diff --git a/README.md b/README.md
index e73b5e1..e5c19bb 100644
--- a/README.md
+++ b/README.md
@@ -9,8 +9,9 @@ Specifically, the installer will try to download and install:
 - `clang4` from <http://r.research.att.com/libs/>
 - `gfortran` from <https://gcc.gnu.org/wiki/GFortranBinaries#MacOS-1>
 
-For those interested, the installer can obtained
-here <https://uofi.box.com/v/r-macos-rtools-pkg>. The pre-built binaries this
+For those interested, the installer can be obtained
+on either the project's [**release page**](https://github.com/coatless/r-macos-rtools/releases/latest)
+or through <http://go.illinois.edu/r-macos-rtools-pkg>. The pre-built binaries this
 installer encloses can be found at <https://developer.apple.com/download/more/>,
 <http://r.research.att.com/libs/>, and <https://gcc.gnu.org/wiki/GFortranBinaries#MacOS-1>. 
 Unlike the [previous installer](https://github.com/coatless/r-macos-clang), 
@@ -25,10 +26,10 @@ of the [University of Edinburgh](http://www.ed.ac.uk/).
 
 ## How do I use the installer?
 
-Download it from <https://uofi.box.com/v/r-macos-rtools-pkg>, 
-open the installer by right clicking to bring up menu and 
-selecting "Open". From here, navigate through it like a normal
- macOS installer.
+1. Download it from the project's [**release page**](https://github.com/coatless/r-macos-rtools/releases/latest)
+   or through <http://go.illinois.edu/r-macos-rtools-pkg>.
+2. Open the installer by either double click or right clicking to bring up menu and selecting "Open".
+3. From here, navigate through it like a normal macOS installer.
 
 **That's it.**
 
@@ -42,13 +43,20 @@ If you want to see behind the curtain, continue reading...
 The macOS _R_ toolchain installer performs four actions that require
 the user's password to accomplish. These actions are:
 
-1. download and install XCode CLI
-1. download and install the `clang4` pre-made binary 
+1. download and install XCode CLI via secure Apple product update
+1. download, verify, and install the `clang4` pre-made binary 
    files into the `/usr/local/clang4` directory
-1. download and install `gfortran`
+1. download, verify, and install `gfortran`
 1. establish the proper paths for `CC`, `CXX`, `CXX**`, `FLIBS`,
     and `LDFLAGS` in the  `~/.R/Makevars` file
 
+Verify steps are conducted using embedded md5 hashes of the files.
+If the hash is not identical to what was embedded, the installer will
+exit. For details as to how this implemented please see
+[Issue 8: Verify pkg hash](https://github.com/coatless/r-macos-rtools/issues/8)
+and the 
+[Pull Request 10: Feature Pkg Hash Verification](https://github.com/coatless/r-macos-rtools/pull/10).
+
 In essence, it provides a graphical user interface installation guide,
 more secure path manipulation, and a smarter handling of a pre-existing
 `~/.R/Makevars` when compared to a pure bash approach.
diff --git a/make_installer.sh b/make_installer.sh
index 87c9df3..e969cb4 100755
--- a/make_installer.sh
+++ b/make_installer.sh
@@ -5,7 +5,7 @@
 #
 # Copyright (C) 2018 James Joseph Balamuta <balamut2@illinois.edu>
 #
-# Version 1.0.0 -- 03/22/18
+# Version 1.1.0 -- 06/06/18
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -28,7 +28,7 @@
 chmod a+x scripts/*
 
 # Version of installer
-INSTALLER_VERSION=1.0.0
+INSTALLER_VERSION=1.1.0
 
 # Create a payload-free package
 
@@ -81,7 +81,7 @@ echo "Rebuilding the package archive..."
 productbuild --distribution distribution.xml \
 	--resources ./build_files \
 	--sign "Developer ID Installer: James Balamuta" \
-	--package-path ./macos-rtools-temp.pkg macos-rtools.pkg
+	--package-path ./macos-rtools-temp.pkg macos-rtools-${INSTALLER_VERSION}.pkg
 
 # Delete the initial build
 rm macos-rtools-temp.pkg
diff --git a/scripts/postinstall b/scripts/postinstall
index f636707..d0a92e6 100755
--- a/scripts/postinstall
+++ b/scripts/postinstall
@@ -5,7 +5,7 @@
 #
 # Copyright (C) 2018 James Joseph Balamuta <balamut2@illinois.edu>
 # 
-# Version 1.0 -- 03/22/18
+# Version 1.1 -- 06/06/18
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -76,6 +76,25 @@ extract_file(){
 	tar fvxz $1 -C /
 }
 
+################################################################
+
+#1 Path to File
+#2 md5 Hash to Check Against
+check_md5_hash() {
+	
+    # Obtain file hash
+    FILE_HASH=$(md5 $1 | awk '{print $4}')
+    
+    # MD5 (path/to/file.pkg) = c29700c4e7b2914073ef7e741eb105bc
+    #  1 %         2        %3%      4 
+     
+    # Check against hash
+    if [ "$FILE_HASH" = "$2" ]; then
+       echo 0
+    else 
+       exit 1
+    fi
+}
 
 ################################################################
 
@@ -138,6 +157,10 @@ REQUESTED_FILE="clang-4.0.0-darwin15.6-Release.tar.gz"
 # Download file into working directory
 download_file $LIBS_URL $REQUESTED_FILE
 
+# Check the hash matches the built-in hash
+# exit if this is not the case
+check_md5_hash $REQUESTED_FILE "2bec4fbae8d9caf6499c941ef9b87eae"
+
 # Extract file into root
 extract_file $REQUESTED_FILE
 
@@ -236,6 +259,8 @@ os_vers_minor="${os_vers[1]}"
 if [[ ${os_vers_minor} -ge 12 && ${os_vers_minor} -le 13 ]]; then
 	GFORTRAN_DMG=gfortran-6.3-Sierra
 	GFORTRAN_PKG=gfortran
+	GFORTRAN_HASH="1849cea667bb714c5c04a8565a9fe231"
+
 	# Fill with appropriate linking statements via heredoc insertion
 	cat <<- EOF >> $R_MAKEVARS_LOCAL
   # The following statement changes the Fortran linking path
@@ -245,6 +270,7 @@ EOF
 else
 	GFORTRAN_DMG=gfortran-6.1-ElCapitan
 	GFORTRAN_PKG=gfortran-6.1-ElCapitan/gfortran
+	GFORTRAN_HASH="457b59a6453069cf72dee9a4f9bf1b0a"
 fi
 
 # Download software
@@ -256,6 +282,10 @@ REQUESTED_FILE=${GFORTRAN_DMG}.dmg
 # Download file into working directory
 download_file $LIBS_URL $REQUESTED_FILE
 
+# Check the hash matches the built-in hash
+# exit if this is not the case
+check_md5_hash $REQUESTED_FILE $GFORTRAN_HASH
+
 # Perform headless installation of gfortran
 # Steps based on
 # https://apple.stackexchange.com/questions/73926/is-there-a-command-to-install-a-dmg