get.acme.sh

1. Install from web: https://get.acme.sh

Install https://github.com/Neilpang/acme.sh

curl https://get.acme.sh | sh

or

wget -O -  https://get.acme.sh | sh

2. Advanced Installation:

https://github.com/Neilpang/acme.sh/wiki/How-to-install