diff --git a/plugin.yaml b/plugin.yaml
index 1d91e12..64bf3e6 100644
--- a/plugin.yaml
+++ b/plugin.yaml
@@ -1,5 +1,5 @@
 name: "subenv"
-version: "0.1.0"
+version: "0.0.12"
 usage: "Substitutes the values of environment variables."
 description: |-
   The plugin allows to substitue the values of environment variables withing a CICD pipeline.
diff --git a/subenv.sh b/subenv.sh
index 5c3464e..5b52c67 100755
--- a/subenv.sh
+++ b/subenv.sh
@@ -1,5 +1,77 @@
-# echo "Testing new plugin"
-
 #!/bin/bash
 
-mv subenv bin/subenv
\ No newline at end of file
+set -euo pipefail
+
+if [ -n "${HELM_S3_PLUGIN_NO_INSTALL_HOOK:-}" ]; then
+    echo "Development mode: not downloading versioned release."
+    exit 0
+fi
+
+validate_checksum() {
+    if ! grep -q ${1} ${2}; then
+        echo "Invalid checksum" > /dev/stderr
+        exit 1
+    fi
+    echo "Checksum is valid."
+}
+
+on_exit() {
+    exit_code=$?
+    if [ ${exit_code} -ne 0 ]; then
+        echo "helm-subenv install hook failed. Please remove the plugin using 'helm plugin remove subenv' and install again." > /dev/stderr
+    fi
+    exit ${exit_code}
+}
+trap on_exit EXIT
+
+version="$(cat plugin.yaml | grep "version" | cut -d '"' -f 2)"
+echo "Downloading and installing helm-s3 v${version} ..."
+
+binary_url=""
+if [ "$(uname)" == "Darwin" ]; then 
+    binary_url="https://github.com/hydeenoble/helm-subenv/releases/download/v${version}/helm-subenv_${version}_darwin_amd64.tar.gz"
+elif [ "$(uname)" == "Linux" ] ; then
+    binary_url="https://github.com/hydeenoble/helm-subenv/releases/download/v${version}/helm-subenv_${version}_linux_amd64.tar.gz"
+fi
+
+if [ -z "${binary_url}" ]; then
+    echo "Unsupported OS type"
+    exit 1
+fi
+checksum_url="https://github.com/hydeenoble/helm-subenv/releases/download/v${version}/helm-subenv_${version}_checksums.txt"
+
+mkdir -p "bin"
+mkdir -p "releases/v${version}"
+binary_filename="releases/v${version}.tar.gz"
+checksums_filename="releases/v${version}_checksums.txt"
+
+# Download binary and checksums files.
+(
+    if [ -x "$(which curl 2>/dev/null)" ]; then
+        curl -sSL "${binary_url}" -o "${binary_filename}"
+        curl -sSL "${checksum_url}" -o "${checksums_filename}"
+    elif [ -x "$(which wget 2>/dev/null)" ]; then
+        wget -q "${binary_url}" -O "${binary_filename}"
+        wget -q "${checksum_url}" -O "${checksums_filename}"
+    else
+      echo "ERROR: no curl or wget found to download files." > /dev/stderr
+    fi
+)
+
+# Verify checksum.
+(
+    if [ -x "$(which sha256sum 2>/dev/null)" ]; then
+        checksum=$(sha256sum ${binary_filename} | awk '{ print $1 }')
+        validate_checksum ${checksum} ${checksums_filename}
+    elif [ -x "$(which openssl 2>/dev/null)" ]; then
+        checksum=$(openssl dgst -sha256 ${binary_filename} | awk '{ print $2 }')
+        validate_checksum ${checksum} ${checksums_filename}
+    else
+        echo "WARNING: no tool found to verify checksum" > /dev/stderr
+    fi
+)
+
+# Unpack the binary.
+tar xzf "${binary_filename}" -C "releases/v${version}"
+mv "releases/v${version}/bin/subenv" "bin/subenv"
+exit 0
\ No newline at end of file