Why do i get "this asset cannot be licanced" warningwhen i try to download a video?

'm trying to download a video from Stock, but every time I hit the "download" button get the same warning: "This video cannot be licensed / You cannot license this video." I upgraded my account to unlimited membership, but nothing has changed. I restarted my computer, cleared my browsing history, and logged in again; same warning and there is no additional explanation about it. Same issue occurs with other videos, too. What am I missing?