[chef] Installation of push jobs on 11.1.6-1 (open source)

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Hi,

I'm trying to install the push jobs package on the Open Source version 11.1.6-1 but

I don't have any install option into chef-server-ctl.

Is there an alternate way to install the push jobs on this version of Chef Server ?

thanks!

-silviu

ps: this is the download  for Chef Server https://opscode-omnibus-packages.s3.amazonaws.com/el/6/x86_64/chef-server-11.1.6-1.el6.x86_64.rpm