diff --git a/installer/mac/preinstall.sh b/installer/mac/preinstall.sh
old mode 100644
new mode 100755
index b722db38..131873c9
--- a/installer/mac/preinstall.sh
+++ b/installer/mac/preinstall.sh
@@ -1,3 +1,66 @@
 #!/usr/bin/env bash
+
+# Kill the existing running instance
 sudo killall Symphony
-sudo rm -rf /Applications/Symphony.app
\ No newline at end of file
+
+delete_app()
+{
+    # Delete the installed version only if it is older than the installing version
+    sudo rm -rf /Applications/Symphony.app
+}
+
+compare_versions()
+{
+    # Get the installer version:
+    CURRENT_VERSION=3.1.0
+
+    # Get the currently installed version:
+    INSTALLED_VERSION=$(plutil -p /Applications/Symphony.app/Contents/Info.plist | awk '/CFBundleShortVersionString/ {print substr($3, 2, length($3)-2)}')
+
+    # If there are no versions installed, just exit the script
+    if [ -z "$INSTALLED_VERSION" -a "$INSTALLED_VERSION" != " " ]; then
+        echo "No version installed, so, exiting without version checks"
+        exit 0
+    fi
+
+    echo "This version is ${CURRENT_VERSION}"
+    echo "Installed version is ${INSTALLED_VERSION}"
+
+    # First, we replace the dots by blank spaces, like this:
+    VERSION=${CURRENT_VERSION//./ }
+    INSTALLED_VERSION=${INSTALLED_VERSION//./ }
+
+    # If you have a "v" in front of your versions, you can get rid of it like this:
+    VERSION=${VERSION//v/}
+    INSTALLED_VERSION=${INSTALLED_VERSION//v/}
+
+    # So, we just need to extract each number:
+    patch1=$(echo ${VERSION} | awk '{print $3}')
+    minor1=$(echo ${VERSION} | awk '{print $2}')
+    major1=$(echo ${VERSION} | awk '{print $1}')
+
+    patch2=$(echo ${INSTALLED_VERSION} | awk '{print $3}')
+    minor2=$(echo ${INSTALLED_VERSION} | awk '{print $2}')
+    major2=$(echo ${INSTALLED_VERSION} | awk '{print $1}')
+
+    # And now, we can simply compare the variables:
+    if [ ${major1} -lt ${major2} ]; then
+        echo "Installed version is newer than this version, exiting installation"
+        exit 1
+    fi
+
+    if [ ${major1} -eq ${major2} -a ${minor1} -lt ${minor2} ]; then
+        echo "Installed version is newer than this version, exiting installation"
+        exit 1
+    fi
+
+    if [ ${major1} -eq ${major2} -a ${minor1} -eq ${minor2} -a ${patch1} -lt ${patch2} ]; then
+        echo "Installed version is newer than this version, exiting installation"
+        exit 1
+    fi
+
+    delete_app
+
+}
+
+compare_versions
diff --git a/installer/mac/version_handler.sh b/installer/mac/version_handler.sh
new file mode 100755
index 00000000..d1ecec37
--- /dev/null
+++ b/installer/mac/version_handler.sh
@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+# Read the actual version from package.json
+VERSION=$(sed -n 's/\"version\"[[:space:]]*\:[[:space:]]*\"\([^}]*\)\",/\1/p' package.json)
+
+# Trim trailing and leading spaces
+VERSION=$(echo ${VERSION} | xargs)
+
+# Replace the current version variable in the pre-install script
+sed -i '' -e "s/CURRENT_VERSION=.*/CURRENT_VERSION=${VERSION}/g" ./installer/mac/preinstall.sh
\ No newline at end of file
diff --git a/package.json b/package.json
index 86101a99..5f9affaf 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
     "demo-win": "npm run prebuild && cross-env ELECTRON_DEV=true electron . --url=file:///demo/index.html",
     "demo-mac": "npm run prebuild && cross-env ELECTRON_DEV=true electron . --url=file://$(pwd)/demo/index.html",
     "unpacked-mac": "npm run prebuild && npm run test && build --mac --dir",
-    "packed-mac": "npm run unpacked-mac && packagesbuild -v installer/mac/symphony-mac-packager.pkgproj",
+    "packed-mac": "sh installer/mac/version_handler.sh && npm run unpacked-mac && packagesbuild -v installer/mac/symphony-mac-packager.pkgproj",
     "unpacked-win": "npm run prebuild && npm run test && build --win --x64 --dir",
     "unpacked-win-x86": "npm run prebuild && npm run test && build --win --ia32 --dir"
   },