LE4 upgrade

In comparing my LE4 with Elements 6, I notice several plugins are not included in the upgrade. Will an upgrade to Elements 6 overwrite my LE4? Or will it leave those plugins available? Also I cannot find the upgrade to Elements 6 from LE4. I searched the forum but got confused by conflicting posts regarding the availability. Is it or is it NOT an available upgrade?

You can look it up yourself: Go to the Steinberg online shop and have a look…