diff --git a/docplex/util/cli.py b/docplex/util/cli.py
index 88e1ca4..a5553c2 100644
--- a/docplex/util/cli.py
+++ b/docplex/util/cli.py
@@ -66,7 +66,7 @@ def get_cplex_info():
     # way of unloading the 'cplex' module and since we will copy
     # a new shared object over the already loaded one, leaving the
     # cplex module loaded can create a segmentation fault.
-    out = subprocess.run(["python", "-c", sub_program], capture_output=True)
+    out = subprocess.run([sys.executable, "-c", sub_program], capture_output=True)
     if out.returncode == 0:
         stdout = out.stdout.decode("utf-8").strip().split(" ")
         if stdout[0] != "Error:":
@@ -78,6 +78,10 @@ def copy_so(cos):
     cos = os.path.realpath(cos)
     pcplex, version = get_cplex_info()
 
+    if version is None:
+        print("ERROR: did not find 'cplex' package")
+        return
+
     version_mneumonic = "".join(version.split(".")[:3])
     so_name = get_so_name(version_mneumonic)
     cpo_name = get_cpo_name(version_mneumonic)