Download the source file gvUpdate.py and run it with python
python gvUpdate.py
Alternatively, write a small script like this - it will need to be located next to the gvUpdate.py for the import to work
import os.path, logging
import gvUpdate
root = os.path.join('path', 'to', 'data', 'location')
if not os.path.exists(root): os.makedirs(root)
logFile = os.path.join(root, 'update.log')
logging.basicConfig(filename=logFile, level=logging.WARNING, format='%(levelname)s: %(asctime)s %(message)s')
gvUpdate.main(root)