Hi @Heisenberg,
The instance selected for installation is already installed and clustered on computer MAchine_01. To continue, select a different instance to cluster.
It looks like this is not a newly installed instance for you. Do you have a cluster instance installed on node 3 and node 4? You can refer to my steps below when you install the new instance.
Of course, if there are no other instances on your node you can choose to install the default instance.
One more thing to note is that if your ultimate goal is to install a four-node cluster, you'd better configure a voting mechanism.
Please refer to this link: WSFC Quorum Modes and Voting Configuration (SQL Server)
Best regards,
Seeya
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