question about manual install freebsd15 from FreeBSD-15.0-RELEASE-amd64-disc1.iso?

Dear all:
FreeBSD-15.0-RELEASE-amd64-disc1.iso don't have kernal.txz and base.txz ... i am wonder how to install freebsd15 to disk ?
if i want to install freebsd15.0 from console , not using bsdinstall tools in console . how to install freebsd15 step by step ? thanks.

note: i know how to install freebsd14 from console and not using bsdinstall tools . (we can extract kernal.txz and base.txz , but FreeBSD-15.0-RELEASE-amd64-disc1.iso don't have those files. so i don't know what is the step . thanks.)
 
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