Hello @saumya1998.
Clicking Download button on https://wordpress.org/plugins/conversation-watson/ page allows you to download plugin as a zip archive, that’s an expected behavior.
There are several ways to install plugins for WordPress.
The easiest one is to install the plugin with your WordPress site’s admin dashboard:
1) log into your WordPress admin dashboard;
2) navigate to Plugins -> Add New page;
https://imgur.com/a/VRqVGgh
3) type in the plugin name watson assistant into the search field;
https://imgur.com/a/Yl3GrR3
4) IBM Watson Assistant plugin card should appear, click Install Now button and proceed with the installation.
5) Activate installed plugin.
To manually install hte plugin (you will need access to your WordPress site filesystem) you can unpack (previously downloaded) plugin archive into the wp-content/plugins/ directory. And activate the plugin with admin dashboard.
Please refer to the official documentation if you need more advanced guide:
https://codex.wordpress.org/Managing_Plugins
the add new button is not showing . Can you help? i have clicked on plugins and there is no option of add new