How can add nexus to beta 4

[kmk]

Hi, I have the beta 3 installed, and recent agrade to beta 4, but how I can add nexus application to the installation withou install all again?

[kotaco]

Assuming you uploaded all the Nexus files. Go to Applications in the AdminCP and you should see it listed at the bottom with the option to install.
 

[kmk]

Thank you Kotako, only replace the nexus file content correct?

When I tried play the custom field, appear error...