Good morning –
I lined up a series of vms and worked away at the 0.89 install on fresh installs of CentOS 6.8.
For this particular error, this seems to address it;
(1) yum -y update
(2) yum install epel-release
(3) yum -y install python-pip
(4) pip install --upgrade setuptools
(5) yum install https://dl.bintray.com/bahmni/rpm/rpms/bahmni-installer-0.89-193.noarch.rpm