[SOLVED] How to revert to Mac OS X after Windows 11 install?

Jan 1, 2022
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So there's this Macbook Pro on which we installed Windows 11.

Installed means we deleted everything - recovery partitions, and absolutely everything, so now the Mac is with Windows only and cannot open the .pkg file that comes with the OS X version.
Is there anyway I can revert back to Mac OS X?

I just cannot boot it. I don't have DVD with MAC, I have just usb flash drive that I make bootable with TransMac but it does not recognize it and I cannot install it now.
 

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