Skipping pictures and card data?

I recently downloaded Forge and love it, it's a fantastic program and I can't believe I didn't know about it before this year. That said, I've encountered a somewhat annoying issue -- not sure if this has already been raised and addressed, so my apologies if it has.
I've noticed that none of the Theros cards currently have pictures, though they show up when you search for them in the Deck Editor (say, Fabled Hero). I wondered if I had simply forgotten to download those pictures, so I went into content downloads and saw that I had some 872 images missing... but upon "downloading" them, Forge gives me an error that it has just skipped all 872 of them.
Is there any way to fix this issue? Are Theros (and presumably other) card images simply not available? I figured that might explain the lack of Theros decks to play in pre-constructed, but wasn't sure given how those cards are still available to search in the Deck Editor.
Thanks!
I've noticed that none of the Theros cards currently have pictures, though they show up when you search for them in the Deck Editor (say, Fabled Hero). I wondered if I had simply forgotten to download those pictures, so I went into content downloads and saw that I had some 872 images missing... but upon "downloading" them, Forge gives me an error that it has just skipped all 872 of them.
Is there any way to fix this issue? Are Theros (and presumably other) card images simply not available? I figured that might explain the lack of Theros decks to play in pre-constructed, but wasn't sure given how those cards are still available to search in the Deck Editor.
Thanks!