(1)
The "cluster strategy" term is taken from the Management API "install-software-package"
https://sc1.checkpoint.com/documents/latest/APIs/index.html#cli/install-software-package~v1.9%20
Parent Parameter Name = cluster-installation-settings
Child Parameter Name = cluster-strategy
Valid Values: all-members, non-active-members-and-failover, non-active-members-no-failover
(2)
As Dameon (PhoneBoy) wrote, the selected cluster must support the selected installation method
In this case, the Quantum Spark cluster does not support the selected installation method
You must select the option "Install on all cluster members"