I was stuck on Pathfinder for a while until I tried 5e. Haven't gone back since, but I get it. When you invest that much into the books, it's hard to just let go. As for the Modules, they don't get uploaded to your library for custom use, but you can individually download the assets and re-upload them into other games. It's a bit of work but doable. Add-ons are the same way, except you can choose an existing campaign to "add-on" the contents to (where Modules require you to create a new campaign). Art Assets are the best way to go in my opinion, because you can add them individually as you need to your campaigns, and most tile set packs can be downloaded and used to assemble a map in another program (like Gimp or Photoshop). This makes your load time better on pages with larger maps, because instead of having 500 tiles make up an image, you have one image for your PC to load up. Hope this advice helps, and happy gaming!