SHELL

install yarn with npm

npm i -g yarn
#if you are on linux use sudo before command like this
sudo npm i -g yarn
// here i nean install -g mean global insall if you want to install local remove -g

yarn download windows

npm install --global yarn


and 

https://classic.yarnpkg.com/latest.msi

install yarn

brew install yarn

install yarn windows

For Windows you can also install with:
choco install yarn

install yarn

sudo apt install yarn

install yarn windows

yarn set version stable

install yarn

curl --silent --location https://dl.yarnpkg.com/rpm/yarn.repo | sudo tee /etc/yum.repos.d/yarn.repo
sudo rpm --import https://dl.yarnpkg.com/rpm/pubkey.gpg
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