Possibly silly question about addons

So, I've been using Roll20 on and off, and I'm only really now figuring things out. The Sunless Citadel (one of my favorite modules) is free until the 14th. Does this mean that after the 14th I won't be able to access it anymore, or is it in my addons permanently now? If I lose access to it after the 14th, well, then fair enough, suppose I'll just buy Yawning Portal. I was just unsure about the wording.

The game you create from the free one will continue in its current state. It won't receive updates but will otherwise be completely playable. You can make copies now that will be playable later.

Oh, Neat! If the Citadel goes well for this group I may just grab the entire Yawning Portal set. Thanks for the info!