Must-share information (formatted with Markdown):
- which versions are you using (8.9.2)
- what are you trying to achieve - install plugin as an admin
- what have you tried so far to achieve this - cannot view the install button
Hello @SujaC and welcome to the community 
did you notice the little message there that installing plugins is a manual task? This change was introduced in 8.9 to reduce the risk of a rouge plugin compromising a sonarqube installation. you now need to deploy the plugin jars manually as stated in the docs.
hope that clarifies things 