To upgrade from HST 1.0.x to SmartSense 1.4.x, first remove HST 1.0.x from all hosts:

# rpm -e hst
# rm -rf /usr/hdp/share/hst
# rm -rf /etc/hst
# rm -rf /var/log/hst

Proceed with the installation documented in the Installing SmartSense without Ambari section.