Set the shader to only receive a single light source in the lighting setting, instead of multi-light

You're likely just on an older version, you need Unity 5.2

Strange - I'll fix this in 1.21 anyhow

That works too! Seems like one of those things that is up to them/Unity rather than SF, so, closing this

Ah, sorry, forgot to fix this one. It's now fixed in the coming 1.21

Set Normal Space to World, then make a Normal blend mode. Plug in a Normal Dir node into Base, and your normal map into Det.

Could you create a new shader with the PBR preset, and paste the shader error here?

It definitely shouldn't happen when starting with the PBR shader, it looks as if the error in due to a variable called "gl_", which doesn't seem to be allowed.

You can probably do it, the only problem is that you have no tangent space.
Try setting normal space to local instead of tangent

This has now been fixed for textures as well