How to bypass Sonatype Nexus

we have sonatype installed at jenkins server. but we are not using it since long time so licence is expired and we don’t want to purchase the licence.

Now we have to install one 3rd party plugin but when we are going to install, it is installing plugin from sonatype nexus which we don’t want to.

Please suggest how can i bypass to install the plugin.

Note : we have done plugin installation for sudo user but issue is coming for “jenkins” user.

Plugin to install : aio cloudmanager

Thanks in advance.