diff --git a/demo_source.sh b/demo_source.sh
deleted file mode 100755
index 82b63c9..0000000
--- a/demo_source.sh
+++ /dev/null
@@ -1,54 +0,0 @@
-#!/usr/bin/env bash
-
-## CONSTANTS
-
-## FUNCTIONS
-
-function upgrade {
-  echo "UPGRADE: $*"
-  if sudo -E "$MIAOU_BASH_DIR"/bin/miaou-bash "$MIAOU_BASH_DIR"/none.sh 3>&1; then
-    :
-  else
-    >&2 echo -------------------------------------------------
-    >&2 echo "SORRY: installation process (version 0.0.0) has failed!"
-    >&2 echo "Either retry later when a next version will come up"
-    >&2 echo "Or report the errorstack printed out above by sending an email to: contact@artcode.re"
-  fi
-}
-
-function assert_supported_distro {
-  if ! grep -E '^ID=debian|^ID_LIKE=debian' /etc/os-release &&
-    ! grep -E '^ID=arch|^ID_LIKE=arch' /etc/os-release; then
-    local distro
-    distro=$(grep -oP '^ID=\K(.*)' /etc/os-release)
-    >&2 echo "unsupported GNU/Linux distribution: $distro"
-    >&2 echo 'only debian-like OR arch-like currently supported'
-    return 10
-  fi
-}
-
-function assert_bash {
-  if [[ $(basename "$SHELL") != 'bash' ]]; then
-    >&2 echo "MIAOU ERROR: you are running on SHELL=$SHELL rather than 'bash'!"
-    return 11
-  fi
-}
-
-function sudo_root {
-  if [[ "$UID" -ne 0 ]] && ! sudo -vp 'SUDO privilege required: '; then
-    >&2 echo "canceled"
-    return 12
-  fi
-}
-## MAIN
-
-set -Eeuo pipefail
-if assert_supported_distro && assert_bash && sudo_root; then
-  if [[ ! -v MIAOU_BASH_DIR ]]; then
-    MIAOU_BASH_DIR=/opt/miaou-bash
-    export MIAOU_BASH_DIR
-  fi
-  upgrade "$@"
-else
-  >&2 echo "MIAOU_BASH_ERROR: requirements failure"
-fi
diff --git a/install.sh b/install.sh
index 3ce3a5b..31903e9 100755
--- a/install.sh
+++ b/install.sh
@@ -1,35 +1,41 @@
 #!/usr/bin/env bash
 
 ## CONSTANTS
+
 BASE_ARCHIVE_URL='https://git.artcode.re/miaou/miaou-bash/archive'
 BASE_TAG_URL='https://git.artcode.re/api/v1/repos/miaou/miaou-bash/tags'
-BASH_SHELL='/bin/bash'
 
 ## FUNCTIONS
 
 function upgrade {
-  echo UPGRADE
+  echo 'upgrading...'
   execute_miaou_lib self-upgrade
 }
 
 function install {
-  echo INSTALL
-
-  local latest_tag
-  latest_tag=$(
+  local release
+  release=$(
     curl -s "$BASE_TAG_URL" |
       grep '"name":' |
       cut -d '"' -f4
   )
-  echo "latest_tag=$latest_tag"
+  echo "deploying release=$release in process..."
 
   local tempfile='/tmp/miaou-bash-latest.tar.gz'
-  curl -so "$tempfile" "${BASE_ARCHIVE_URL}/${latest_tag}.tar.gz"
-  sudo tar -xzf "$tempfile" --directory "$(dirname "$MIAOU_BASH_DIR")"
-  rm "$tempfile"
-  execute_miaou_lib initiate
-
-  echo "miaou-bash successfully $deployment_type_adjective"
+  if curl -so "$tempfile" "${BASE_ARCHIVE_URL}/${release}.tar.gz"; then
+    if sudo tar -xzf "$tempfile" --directory "$(dirname "$MIAOU_BASH_DIR")"; then
+      rm "$tempfile"
+      if execute_miaou_lib initiate; then
+        echo 'successfully deployed'
+      else
+        miaou_error 'unable to initiate further'
+      fi
+    else
+      miaou_error 'unable to uncompress archive'
+    fi
+  else
+    miaou_error 'unable to download release'
+  fi
 }
 
 function assert_supported_distro {
@@ -49,20 +55,27 @@ function once_installed {
     "$(readlink /etc/inputrc)" == "$MIAOU_BASH_DIR"/etc/inputrc ]]
 }
 
+function miaou_error {
+  >&2 echo --------------------------------------------------------------
+  >&2 echo "MIAOU_ERROR: $1"
+  >&2 echo "Either retry later when a newer version will come up,"
+  >&2 echo "Or report the errorstack printed out above to: contact@artcode.re"
+}
+
 function execute_miaou_lib {
-  sudo -E "$MIAOU_BASH_DIR"/bin/miaou-bash "$MIAOU_BASH_DIR"/lib/"$1".bash
+  sudo -E "$MIAOU_BASH_DIR"/bin/miaou-bash "$MIAOU_BASH_DIR"/lib/"$1".sh 3>&1
 }
 
 function assert_bash {
   if [[ $(basename "$SHELL") != 'bash' ]]; then
-    >&2 echo "MIAOU ERROR: you are running on SHELL=$SHELL rather than 'bash'!"
+    >&2 echo "running on SHELL=$SHELL rather than 'bash'!"
     return 11
   fi
 }
 
 function sudo_root {
   if [[ "$UID" -ne 0 ]] && ! sudo -vp 'SUDO privilege required: '; then
-    >&2 echo "canceled"
+    >&2 echo "unauthorized!"
     return 12
   fi
 }
@@ -81,5 +94,5 @@ if assert_supported_distro && assert_bash && sudo_root; then
     exec bash -l
   fi
 else
-  >&2 echo "MIAOU_BASH_ERROR: requirements failure"
+  >&2 echo "MIAOU_ERROR: missing requirements"
 fi
diff --git a/none.sh b/none.sh
deleted file mode 100644
index 1915d87..0000000
--- a/none.sh
+++ /dev/null
@@ -1,8 +0,0 @@
-#!/usr/bin/miaou-bash
-
-echo A
->&2 echo warning1
->&2 echo warning2
-echo B
-false
-echo C