Purchased face doesn't show and need to buy Premium to using

Hi everyone, I just bought this face SI Design - SI | FLASH - watch face for Apple Watch, Samsung Gear S3, Huawei Watch, and more - Facer
After I added to my favorite, then it doesn’t show in app. I checked on website it said that I need to buy premium to using this face
So how can I using this face without buying premium
Thank you so much