Lightroom 6.4 is not different depending on DVD vs download installation.
Show us a screen capture of what you mean by this: "(in full screen mode respectively after starting LR the bar of my window is invisible and cannot be shown - not really the full screen mode)."
sorry, but it is. structure of some menus is different (order of items) and window appearance is, too.
So show us a screen capture
I have deinstalled the DVD-version and I don't want to spend any time to reinstall it only to show seen captures. I already spent much more time on this issue as desired.
believe me that I am skilled using a mac and any software in the past.
beliebe me the mentioned issue above is the truth - clean installation on both macs was assumed.
sorry for stealing all your time. thanks a lot.
Problem is solved but I wonder why this is different.
If uninstalling was the solution to the problem, then you didn't really solve the problem. You need to "believe us" when we tell you that there is no difference in the menus between the download version and the DVD version. They are the same program. Don't know what happened in your case, but something went wrong. And without seeing what you experienced, there's no way to offer assistance.