i can download unlimited videos if i have subscribe for one month

Videos are not part of the subscription. You need to pay each video extra.

Adobe Creative Cloud is a suite of design software and online services for desktops and mobile devices.  Subscribers have access to a collection of software for graphic design, document preparation, typography, audio/video editing, web development, photography and more...  

Adobe Stock is separate.  10 standard assets per month for $30/month all the way up to 750 standard assets for $200/month.  Standard assets = Images, Templates and 3D.  Premium assets like video cost more per asset.

https://stock.adobe.com/plans

How any of this relates to "downloading videos," I have no idea.  Are you sure you're in the right place?

Subscribe to what?

Is this a question about Adobe Stock?