How to install plugins?

In the 8.0.1 version was located on File/Application/Install but I can’t find on 8.5. How to install plugins?

Subject: Make sure you have View-Advanced Menus turned on

Make sure you have View-Advanced Menus turned on - you should then see the File-Application-Install option

Subject: com.ibm.notes.branding/enable.update.ui=true in plugin_customization.ini <>

Subject: Doesn’t work if desktop policy disables Allow user initiated updates

Does anyone know how to override the desktop policy to enable manually installing plug-ins (EUM)?

Otherwise we will need to have a different set of policies for developers who want to manually install plug-ins for testing purposes.

Subject: Delete the Workspace directory, solve my issue

I’m having the same issue, thus, the problem was resolved after i delete the Workspace directory in Notes Data directory.