If you use RPM package then just type:
Before updating via Web Interface you have to add permission for the apache user for sudo:
How to start use RPM read in Installation instruction
Because of a new version of Python there is conflict between two packages: The newer package python36-mod_wsgi conflicts with the older python35u-mod_wsgi. For updating to version 4.2.3 you should delete the old package before update:
Because of has been made a lot of work for improving work with groups and roles needs to update a HAProxy-WI DB. It can be done only manually.
First of all update HAProxy-WI, after run next commands:
Also you should re-create all you groups. If you re-create the groups in the same order that they created, it will not affect on your users and servers.