Download the suitable version of Traefik for your system from here:
https://github.com/traefik/traefik/releases
as an example, we'll be download the linux 64 bit version:
wget https://github.com/traefik/traefik/releases/download/v2.8.7/traefik_v2.8.7_linux_amd64.tar.gz
extract those package:
tar -xzvf traefik_v2.8.7_linux_amd64.tar.gz
set the traefik as executable and move the traefik binary to linux bin folder