Big Sur .rdr file

I am trying to install hackintosh big Sur on my haswell i5 but I don't want to go through the process of flash drive I found a tutorial which installs it without flash drive but requires .rdr file instead of a .raw file and I am unable to find any download link for a big Sur .rdr , but but the montrery.

submitted by /u/New_Ear_7218
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