diff --git a/major_projects_grabber/major_projects_grabber.py b/major_projects_grabber/major_projects_grabber.py
index 0bf4489..f6c12e0 100644
--- a/major_projects_grabber/major_projects_grabber.py
+++ b/major_projects_grabber/major_projects_grabber.py
@@ -22,6 +22,18 @@ from tqdm import tqdm
 from requests.exceptions import ConnectionError, InvalidURL
 
 
+def make_safe(s):
+    """Remove characters that would be invalid in a filepath"""
+    # Remove '\', '*', '"', '<', '>' '|'
+    s_safe = re.sub('\\\|\*|"|<|>\|', '', s)
+
+    # Replace '/' and ':' with '-'
+    s_safe = re.sub(':', ' -', s_safe)
+    s_safe = re.sub('/', '-', s_safe)
+
+    return s_safe
+
+
 def mod_ids_from_search(search_results_url):
     """Get modification job IDs from search results URL"""
 
@@ -58,6 +70,10 @@ def get_document_list(mod_id, output_dir):
     # Get list of document folders
     folders = mod_tree.xpath('//div[@class="folder_row"]')
 
+    # Remove invalid characters before creating folders
+    project_name = make_safe(project_name)
+    mod_name = make_safe(mod_name)
+
     # Create modification folder
     mod_dir = os.path.join(output_dir, project_name, mod_name)
     os.makedirs(mod_dir, exist_ok=True)
@@ -94,15 +110,14 @@ def get_document_list(mod_id, output_dir):
 def download_document(url, document_path):
     """Download document from given url"""
 
-    # Create output directories as required
+    # Check if destination path is too long (Windows filename limitation)
     try:
-        os.makedirs(os.path.dirname(document_path), exist_ok=True)
-    except OSError:
-        logging.error(('Failed to download {4}\n'
-                       '  Project: {1}\n'
-                       '  Modification: {2}\n'
-                       '  Folder: {3}\n').format(*document_path.split(os.sep)))
-        return
+        open(document_path, 'a').close()
+    except FileNotFoundError:
+        document_path = '\\\\?\\' + os.path.abspath(document_path)
+
+    # Create output directories as required
+    os.makedirs(os.path.dirname(document_path), exist_ok=True)
 
     # Check if file exists
     if os.path.isfile(document_path):
@@ -119,12 +134,6 @@ def download_document(url, document_path):
                  '  Folder: {3}\n').format(*document_path.split(os.sep)))
             return
 
-        # Check if destination path is too long (Windows filename limitation)
-        try:
-            open(document_path, 'a').close()
-        except FileNotFoundError:
-            document_path = '\\\\?\\' + os.path.abspath(document_path)
-
         # Write file to disk
         with open(document_path, 'wb') as f:
             shutil.copyfileobj(r.raw, f)
@@ -191,6 +200,7 @@ def main():
             doc_pbar.set_description(doc_name)
 
             # Download document
+            print(doc)
             download_document(doc['url'], doc['document_path'])
 
     # Tidy up console after tqdm