How to install and build a contract

[kopeboy]

Not enough info at https://docs.substrate.io/tutorials/smart-contracts/prepare-your-first-contract/#install-the-substrate-contracts-node

I could download the tar and extract it, what then? I guess I have to put substrate-contracts-node in my PATH, but no instructions are given (command not found: substrate-contracts-node)

If I open the binary manually and in a different terminal tab, inside the flipper contract example, I run cargo contract build I get ERROR: Loading of original wasm failed (cargo test was instead successfull).