Marketplace purchase will not "Add to Project"

Hello,

I recently purchased the Semi-Arid Desert Environment by Anil Isbilir on the Unreal Marketplace. It says that it is supported by Engine versions 4.9-4.17 and I am using 4.16. It is appearing in my vault in the Epic launcher, and when I try to use the “Add to Project” button, it shows me all my projects and lets me choose one. However, when I open the projects, the content is not there. I have tried adding it to several different projects, including new projects and ones using different versions of the engine, and it won’t add to any of them. I looked in the vault cache and it isn’t appearing there either, so it simply isn’t downloading and I’m not sure why or how to fix it.

Any help on resolving this issue would be greatly appreciated.

I have the same question.