diff --git a/bin/get-version-from-legacy-file b/bin/get-version-from-legacy-file
deleted file mode 100755
index e423a07..0000000
--- a/bin/get-version-from-legacy-file
+++ /dev/null
@@ -1,13 +0,0 @@
-#!/usr/bin/env bash
-
-get_legacy_version() {
-    local current_directory="$1"
-    local python_version_file="$current_directory/.python-version"
-
-    # Get version from .python-version file. .python-version is used by pyenv
-    if [ -f "$python_version_file" ]; then
-        cat "$python_version_file"
-    fi
-}
-
-get_legacy_version "$1"
diff --git a/bin/install b/bin/install
index c16eecb..2439a44 100755
--- a/bin/install
+++ b/bin/install
@@ -1,20 +1,23 @@
 #!/usr/bin/env bash
 
-source $(dirname $0)/utils.sh
+set -e
+
+source "$(dirname "$0")"/utils.sh
 
 install_python() {
-  local version="$1"
-  local install_path="$2"
+  local install_type=$1
+  local version=$2
+  local install_path=$3
 
-  local tmp_dir="$(mktemp -d -t asdf-python.XXX)"
+  if [ "$install_type" != "version" ]; then
+    echoerr "Cannot install specific ref from source, sorry."
+    echoerr "For a list of available versions, see \`asdf list-all python\`."
+    exit 1
+  fi
 
-  ensure_python_build_installed
-
-  ASDF_CONCURRENCY="${ASDF_CONCURRENCY:-1}"
   echo "python-build $version $install_path"
-  MAKE_OPTS="$MAKE_OPTS -j$ASDF_CONCURRENCY" TMP_DIR="$tmp_dir" $(python_build_path) $version $install_path
-  echo "Cleaning up"
-  rm -rf "$tmp_dir"
+  $(python_build_path) "$version" "$install_path"
 }
 
-install_python $ASDF_INSTALL_VERSION $ASDF_INSTALL_PATH
+ensure_python_build_installed
+install_python "$ASDF_INSTALL_TYPE" "$ASDF_INSTALL_VERSION" "$ASDF_INSTALL_PATH"
diff --git a/bin/list-all b/bin/list-all
index 0f12fee..5129e40 100755
--- a/bin/list-all
+++ b/bin/list-all
@@ -1,11 +1,11 @@
 #!/usr/bin/env bash
 
-source $(dirname $0)/utils.sh
+source "$(dirname "$0")/utils.sh"
 
 list_all() {
   ensure_python_build_installed
+
   $(python_build_path) --definitions | tr '\n' ' '
-  rm -rf "$tmp_download_dir"
 }
 
 list_all
diff --git a/bin/utils.sh b/bin/utils.sh
index 50b9d06..b7913a8 100755
--- a/bin/utils.sh
+++ b/bin/utils.sh
@@ -1,3 +1,7 @@
+echoerr() {
+  printf "\033[0;31m%s\033[0m" "$1" >&2
+}
+
 ensure_python_build_installed() {
   if [ ! -f "$(python_build_path)" ]; then
     download_python_build