Commercial use of images after subscription cancellation

Yes, anything you licensed stays available for you to use without expiration according to the licensing terms, even after cancellation of the subscription. You do not need to download the assets immediately, but be aware, that the assets may be deleted from the database either by the contributor or by Adobe without a warning. In that case, it is not possible to download the asset, even if it has been properly licensed. As long as the asset is in the database, you can download the asset, even after cancellation.

Unlicensed credits get lost at the end of your subscription, so do not buy the subscription to fill up your credits, without licensing. It doesn't work. 

So far as I can see that is the case. The credits will disappear when you cancel, but if you have ALREADY purchased AND DOWNLOADED the images you have the right to use them within the license. It is a good question because some other stock agencies put limitations, such as - they must be used in a publication within a year.

You already know this, but for the benefit of anyone else reading this: only the more expensive month-by-month contract can be cancelled in this way; the normal contracts are for a year, auto renewing.