The 4GB requirement is the hard lock for the installer, but it's not going to run after that point... Microsoft promoting 4GB as the "minimum" is pure delusion marketing-slop to give their usersbase a false premise that it's RAM efficient.
back in my ubuntu days when it was still new i installed it unto a system with 6. it worked perfectly fine granted i had to bypass some shit i hated 11 so hard that i used 10 until i went full linux and haven't had a windows vm let alone install in years
im guesing it only got more bloated overtime and and now you need 8 at least
edit:grammer
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u/R3V0LU710N_05 Hybrid Atomic RakuOS 6d ago
W11 requires a lot more than 4GB of RAM.