"The Blacksmith: Characters" Asset displays missing (magenta) textures on characters unless the shaders are set to "Standard"

1. What happened

Imported "The Blacksmith: Characters" asset from the asset store and on loading either of the characters' scenes saw that the textures for models are displayed as if missing.

2. How we can reproduce it using the example you attached
- Download and import "The Blacksmith: Characters" project from the asset store;
- Load "Volund" scene and see that the character model is displayed in magenta (missing textures).

Note: Selecting the separate objects and setting their shader to "Standard" fixes the problem.