NewbieQ. Importing Standard Assets & BigTree_bark_diffuse

I’ve created an empty 3D project (2019) and started to follow the building a tree manual (Unity - Manual: Building Your First Tree). It instructs me to choose the BigTree_bark_diffuse material but I don’t have that available to me. I wondered if I’d somehow avoided installing the default package but when I looked at Installing the Default Package I only have an Import Custom Package option. I realise I’ve done something dumb but I can’t spot it :S

Same here. Where’s that material?

Have you downloaded the package? Try that, and then to install it, go to custom packages, and browse in your file manager to find it.

Thxs, but where’s that download?