diff --git a/catalyst/exchange/utils/exchange_utils.py b/catalyst/exchange/utils/exchange_utils.py
index 5c40a26d..658a7002 100644
--- a/catalyst/exchange/utils/exchange_utils.py
+++ b/catalyst/exchange/utils/exchange_utils.py
@@ -446,12 +446,13 @@ def remove_old_files(algo_name, today, rel_path, environ=None):
     # run on all files in the folder
     for f in os.listdir(folder):
         try:
-            creation_unix = os.path.getctime(os.path.join(folder, f))
-            creation_time = pd.to_datetime(creation_unix, unit='s', )
+            file_path = os.path.join(folder, f)
+            creation_unix = os.path.getctime(file_path)
+            creation_time = pd.to_datetime(creation_unix, unit='s', utc=True)
 
             # if the file is older than 30 days erase it
             if today - pd.DateOffset(30) > creation_time:
-                    os.unlink(f)
+                os.unlink(file_path)
         except OSError:
             error = 'unable to erase files in {}'.format(folder)
 
diff --git a/docs/source/install.rst b/docs/source/install.rst
index 5c24159f..6ef366b5 100644
--- a/docs/source/install.rst
+++ b/docs/source/install.rst
@@ -89,7 +89,7 @@ Once either Conda or MiniConda has been set up you can install Catalyst:
 
    .. code-block:: bash
 
-    conda env create -f python2.7-environment.yml
+      conda env create -f python2.7-environment.yml
 
 4. Activate the environment (which you need to do every time you start a new 
    session to run Catalyst):
@@ -132,10 +132,19 @@ with the following steps:
       conda env remove --name catalyst
 
 2. Create the environment:
+   
+   for python 2.7:    
 
    .. code-block:: bash
 
       conda create --name catalyst python=2.7 scipy zlib
+    
+  or for python 3.6:
+    
+   .. code-block:: bash
+
+      conda create --name catalyst python=3.6 scipy zlib
+
 
 3. Activate the environment: