Du könntest das hier versuchen, falls möglich.
  
  
    From your description, I assume you don’t have shell access, no option to run the suggested occ app:disable. 
This is what I would try in such situation. Without any warranty. 
If you have a tool like phpMyAdmin to access the DB, you can use it, to disable all the apps in question. 
Go to table oc_appconfig, configkey enabled, set configvalue to No. Repeat for each app in question. Then start over with the upgrade. 
Finally you can enable the apps in the admin panel. One by one, to be sure!
   
 
             
            
              
           
          
            
              
                Renate  
              
                  
                    January 8, 2019, 10:21am
                   
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              Hi, there is another topic (how can I link them?) Link  where I was able to find the way out. Thanks for your support, too.
             
            
              
           
          
            
              
                alfredb  
              
                  
                    January 8, 2019, 11:58am
                   
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              I do not understand this.  Could you repair and finish your update as described in the linked post?
             
            
              
           
          
            
              
                Renate  
              
                  
                    January 8, 2019,  1:52pm
                   
                  25 
               
             
            
              Yes. After some research I was able to connect via Mac terminal and use the occ codes. New territory for me. There were no app installed before, I had do do this first via Marketplace and FTP. Finally the update ran successfully.