Install the newest codemeter software (help found here http://support.codemeter.de/en/index.html ) Download the update files from esim and install them...activate the updated licence and that is pretty much it.
No need to purchase, download or install older versions.
In fact, you should uninstall any older version of SB Pro PE on your computer, and also CodeMeter runtime versions... before installing the new version.
And once you do, in order to edit stock scenarios or maps which ship with the game, you'll want to find the folder where these live and give yourself administrative privileges to do that.
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No one gets out of here alive.
I know of no specific case where they did not. Of course, it depends on how old they really are. For example, in old SB1 scenarios it is possible to drive across water bodies that aren't very wide - these routes would eventually require some editing. But this is the most extreme case that I can remember, and I suppose that most old scenarios have been updated over the past six years.