Did not know that when I install “AS 6.5” the “AS Help 6.5” is not installed or an old version is installed.
They changed the package that the AS installation is not that big in size and only the minimal parts are included.
So yes, you have to download the help separately or update it with Tools→ Upgrades from within AS. ( Same with the Automation Runtimes.. AR6.5.1 should be downloaded/updated on a second step.