How to unpack pkg file from OSX 10.10 and higher

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I tried to extract Essentials.pkg from OS X 10.10 following by solution from this answer. But have no success.

I get error gunzip: unknown compression format if i try to extract with cmd: cat Payload | gunzip -dc |cpio -i

I get error: tar: Unrecognized archive format if i try to extract with cmd: tar xzvf Payload Could anyone suggest any solution?

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