If you look in the folder where the Catalog is located there may be still a lock file present which will stop LR from opening. This may not be the cause but worth investigating as you force closed the program.
What was the error message when you tried you update?
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First of all see if you have a lrcat.lock file next to your catalog file. The lock file will prevent a catalog from opening. Just delete it (it's supposed to be deleted when you close Lr).
Other than that there is the CC cleaner tool. This will remove all remaining traces of installed applications, so that you can do a fresh reinstall.
Apologies for the late reply and thanx for your suggestions.
The good news: The problem has been solved.
Just some comments:
I had run CCleaner before I placed the post, but due to your suggestions I searched the PC for lrcat.lock. I deleted that file, but that did not rid me of the dead processes in the tasklist. However, it made me aware that there are other folder (in particular: users) where also files are written to. So I searched my PC for "lightroom" and deleted everything that was found. This finally lead to disappearance of the dead processes in the tasklist and then I was able to reinstall the program and it worked.The only difference to my first attempt was that now I had an Adobe account and was log on to that. I don´t know, whether that made the difference but at any rate, its working now. thanx again
I rejoiced a little bit to early. I was able to import some pictures in the catalogue, then I closed the program but if I want to restart lightroom now it is somehow trapped in something (the rotating circle appears and is not going away,even if I wait quite long [>10 minutes]