As the message says, you can't install a PLATINUM license to a cluster where security is enabled but TLS is not configured for the transport layer. Your options are as follows:
Enable TLS for the transport layer by following our documentation
Disable security if you don't plan on using the features that it offers by setting xpack.security.enabled: false in all your nodes.
Have you configured TLS for both the http and the transport layer? If so, can you share the relevant parts of your configuration?
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