Please read the docs. We only support the upgrading and installation of the software if it is done using the methods outlined in those docs. Why? Many third party installers such as those provided by hosts are modified by them or are very out of date. We often find they have introduced bugs or we are having to go back and re-fix things we have done a long time ago. Worse still are when sites get hacked because users have been provided with out of date code by their hosts.
Having said all that, upgrading should be a very straight forward exercise, replacing most of the files with the new versions then running update.php to do any database fixes. Should take about 5 mins in most cases. Some software packages have a button built into the software to handle this. This could be done with CPG but I feel it is a bit of overkill.