I'm afraid you can't. Even if you buy Doodleoze Free Footage Module without the Standard Version, you will not be able to use Doodleoze without the Standard version.
Here is why:
1. Doodleoze Standard Version is the main product which comes as Monthly, Annual or a Special One-Off payment subscription.
2. Doodleoze Free Footage Module is an Upgrade or Up-sell which gives you ability to get Royalty Free Footage.
3. Since Doodleoze Free Footage Module is not independent, you will need to subscribe for the main product Doodleoze Monthly, Annual or an Special One-Off payment subscription. Else you can't use Doodleoze with only Doodleoze Free Footage Module in your account.
Note: If you didn't buy Doodleoze Free Footage Module yet, you may learn more and buy it from our sales page here: http://doodleoze.net/freefootage