For for error unrar binary not found

cps/admin.py

@@ -683,6 +683,7 @@ def _configuration_update_helper():
     reboot_required |= reboot
     # Rarfile Content configuration
     _config_string(to_save, "config_rarfile_location")
+    if "config_rarfile_location" in to_save:
         unrar_status = helper.check_unrar(config.config_rarfile_location)
         if unrar_status:
             return _configuration_result(unrar_status, gdriveError)

cps/helper.py

@@ -778,7 +778,7 @@ def get_download_link(book_id, book_format, client):
     book_format = book_format.split(".")[0]
     book = calibre_db.get_filtered_book(book_id)
     if book:
-        data1 = data = calibre_db.get_book_format(book.id, book_format.upper())
+        data1 = calibre_db.get_book_format(book.id, book_format.upper())
     else:
         abort(404)
     if data1: