Users can't donwload some watch faces

I have a number of customers saying that they are unable to download some watch faces (free). This is the latest one for example:

What happens when they try? Do they get some kind of error message?

The selected watch face just does not appear on the watch

I have had the same problem with some of mine, Sometimes when they add it to their Watchface Collection, it shows a Black Screen instead of the watchface.