So if you are running QLik Sense 3.0, that means that you are still using the old Persistence Model (synchronized persistence)
So the guide you mentioned in the description is the correct one.
In addition, you should go for a step upgrade so I would suggest:
Upgrade from Qlik Sense 3.0 Synchronized Persistence to Qlik Sense 3.2.5 Shared Persistence.
Upgrade from Qlik Sense 3.2.5 to June 2017 or September 2017. (we have known issues when upgrading directly from Qlik Sense 3.2 or earlier to November 2018 and probably later) See https://support.qlik.com/articles/000062033