Check linuxrepos for download

pacman -Si linuxrepos/mkinitcpio-firmware

Repository      : linuxrepos
Name            : mkinitcpio-firmware
Version         : 1.4.0-1
Description     : Optional firmware for the default linux kernel to get rid of the annoying 'WARNING: Possibly missing firmware for module:' messages
Architecture    : any
URL             :
Licenses        : GPL
Groups          : None
Provides        : None
Depends On      : linux-firmware  aic94xx-firmware  ast-firmware  linux-firmware-qlogic  linux-firmware-bnx2x  linux-firmware-liquidio  linux-firmware-mellanox  linux-firmware-nfp  wd719x-firmware  upd72020x-fw
Optional Deps   : mkinitcpio: build the initramfs
                  linux: default linux preset
Conflicts With  : None
Replaces        : None
Download Size   : 13.91 KiB
Installed Size  : 0.23 KiB
Packager        : Wayne Wesley 
Build Date      : Sat 24 Dec 2022 12:21:37 GMT
Validated By    : MD5 Sum  SHA-256 Sum  Signature

How to install from linuxrepos

pacman -S linuxrepos/mkinitcpio-firmware