docs: def _load_cache(self):
          """Load cache file and return cached data"""
          # If the cached file exist, read-it
          max_refresh_date = timedelta(days=7)
          cached_data = {}
          try:
              with open(self.cache_file, 'rb') as f:
                  cached_data = pickle.load(f)
          except Exception as e:
              logger.debug("Cannot read version from cache file: {} ({})".format(self.cache_file, e))
          else:
              logger.debug("Read version from cache file")
              if (cached_data['installed_version'] != self.installed_version() or
                      datetime.now() - cached_data['refresh_date'] > max_refresh_date):
                  # Reset the cache if:
                  # - the installed version is different
                  # - the refresh_date is > max_refresh_date
                  cached_data = {}
          return cached_data