According to the docs, this should install the marvel UI plugin:
/opt/kibana/bin/kibana plugin -i elasticsearch/marvel-ui/latest
This is the result I am getting:
Installing marvel-ui 
Attempting to extract from https://download.elastic.co/elasticsearch/marvel-ui/marvel-ui-latest.tar.gz  
Attempting to extract from https://github.com/elasticsearch/marvel-ui/archive/latest.tar.gz  
Plugin installation was unsuccessful due to error "Not a valid url."
Curl of the urls above returns a 404.
Update:  The plugin installs if you use this command:
/opt/kibana/bin/kibana plugin -i elasticsearch/marvel/latest, so I guess the documentation is incorrect.
The cluster page in marvel is showing my cluster as having a trial license that expires in 30 days.  What license/product is that referring to?
             
            
               
               
               
            
            
           
          
            
              
                warkolm  
                (Mark Walkom)
               
              
                  
                    October 30, 2015,  7:54am
                   
                   
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              There was a problem with the docs, we've since updated it to fix this.
Apologies for the confusion!
             
            
               
               
               
            
            
           
          
            
              
                rostiar  
                (Rostislav Aronov)
               
              
                  
                    November 1, 2015,  8:34am
                   
                   
              3 
               
             
            
              Still does not work for me!
             
            
               
               
               
            
            
           
          
            
              
                rostiar  
                (Rostislav Aronov)
               
              
                  
                    November 1, 2015,  3:27pm
                   
                   
              4 
               
             
            
              /opt/kibana/bin/kibana plugin -i elasticsearch/marvel/latest
             
            
               
               
               
            
            
           
          
            
              
                NSK  
                (NSK)
               
              
                  
                    October 22, 2016,  5:33am
                   
                   
              5 
               
             
            
              try /opt/kibana # bin/kibana plugin --install marvel --url file:///marvel-2.4.1.tar.gz
Latest plugin marvel-2.4.1.tar.gz is working as expected.
             
            
               
               
               
            
            
           
          
            
              
                warkolm  
                (Mark Walkom)
               
              
                  
                    October 22, 2016,  5:36am
                   
                   
              6 
               
             
            
              This thread is nearly a year old though!
             
            
               
               
               
            
            
           
          
            
              
                NSK  
                (NSK)
               
              
                  
                    October 22, 2016,  5:51am
                   
                   
              7 
               
             
            
              Yep, I am aware   .. Just put a note so that it could be useful to someone who is facing the same issue by following the docs.
             
            
               
               
               
            
            
           
          
            
              
                bohyun  
                (Bohyun Kim)
               
              
                  
                    October 22, 2016,  6:08am
                   
                   
              8 
               
             
            
              npsenthilkumar   Thank you!