This can be done in any command line interface on the server like the terminal in Web Host Manager.

Imunify 360

First, unregister your existing license key:

imunify360-agent unregister

After that, for key-based licenses, run:

imunify360-agent register (Your Key)

For IP-based licenses:

imunify360-agent register IPL

Use the word IPL, not an actual IP address for this command.

Imunify+

CloudLinux key-based license:

imunify-antivirus register (Your Key)

CPanel IP-based license:

Upgrade free imunify+: imunify-antivirus register IPL

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Once any of these are active, run this and add the Imunify tools to each cPanel account.

/usr/share/av-userside-plugin.sh