diff --git a/renew_cert.sh b/renew_cert.sh
index 042b83e..52d3f51 100755
--- a/renew_cert.sh
+++ b/renew_cert.sh
@@ -5,10 +5,10 @@ path="$( cd "$(dirname "$0")" ; pwd -P )"
 #############
 # variables
 acme_dir=/srv/certs/acme-challenge/.well-known/acme-challenge
-opt_folder=$path/opt
-account_key=$opt_folder/account.key
-acme_tiny=$opt_folder/acme_tiny.py
-openssl_conf=$opt_folder/openssl.conf
+opt_dir=/srv/certs/.opt
+account_key=$opt_dir/account.key
+acme_tiny=$opt_dir/acme_tiny.py
+openssl_conf=$opt_dir/openssl.conf
 
 #############
 # script
@@ -21,6 +21,11 @@ if [ $# -eq 0 ]; then
   exit 1
 fi
 
+if [ ! -d "$opt_dir" ]; then
+  echo "opt dir doesn't exists!"
+  exit 1
+fi
+
 if [ ! -d "$acme_dir" ]; then
   echo "acme directory ($acme_dir) doesn't exists!"
   exit 1
@@ -32,12 +37,13 @@ if [ ! -f "$account_key" ]; then
 fi
 
 if [ ! -f "$acme_tiny" ]; then
-  echo "Python script acme_tiny.py is missing"
+  echo "Python script acme_tiny.py is missing. Downloading..."
+  wget -qo $acme_tiny https://raw.githubusercontent.com/diafygi/acme-tiny/4.0.3/acme_tiny.py
   exit 1
 fi
 
 acme_dir=${acme_dir%/}
-opt_folder=${opt_folder%/}
+opt_dir=${opt_dir%/}
 
 # check if python is installed
 command -v python >/dev/null 2>&1 || { echo >&2 "I require python but it's not installed.  Aborting."; exit 1; }