How to get a Dead tree script, texture or/and object for unity without the asset store??

Hello Fellow Unity Peeps, My name is Catulus and I need help with the following question: How to get a Dead tree script, texture or/and object for unity without the asset store?? I have tried many times to use the asset store and it just doesn’t work for me and my unity assessment is due in 2 week, so I am trying to find a script, texture or/and object of a dead tree. So far I was unsuccessful so I decide to come here for help. If you can help I will be very grateful.

a.) Unity comes with a tree creator: Unity - Manual: Building Your First Tree

b.) Make it “dead” by not adding any leaves and giving it a greyish texture.

c.) Why would a dead tree need a script? What behaviour would it have?