Upgrading process checklist
As mentioned, using the PowerShell upgrade is only supported from Dynamics NAV 2013 forward. There are ways to use PowerShell upgrade if you're running earlier versions, but that will be beyond the scope of this book. So, the simple rule is to get to at least Dynamics NAV 2013 to make your upgrade easier in the future.
If you are on older versions, the official documentation tells you to follow the Microsoft Dynamics NAV upgrade guide for the respective versions for details. Essentially, if you are coming from versions previous to X, you will have to follow guide Y, and so on. If you follow all the steps detailed in all the guides, it will take a long time. Hence the rule that the older the version you're on, the more time consuming and more complex is the upgrade.
But there is good news. If you are planning to upgrade from the older versions, you can skip some steps since the ultimate goal is to get to the latest version. In this section, we will...