Hi Anna,
What was wrong with the tone of my reply?
I'm sorry if there is something, it wasn't my intention.
As you can see, I did my best to explain all steps in details.
If you are talking about the "
MUST" part of the reply - I just wanted to stress out that you do need to have a backup in case something goes wrong.
I do not need you to explain how to update a template but, specifically, if this template can support the updates since you have decided not to produce it anymore.
I do believe that the Hammer template will work just fine with all Joomla 3.x versions (including the last one that will be released - Joomla 3.9).
If something goes wrong, just open a new discussion and I will look at the issue.
However, we will not update the Hammer template (and any other of our old Helix templates) to make them work with the upcoming Joomla 4.
We will update all our current (Gantry 5) templates in order to make them work on Joomla 4. We will publish a blog post about that in a couple of weeks.