Check linuxrepos for download

pacman -Si linuxrepos/minecraft-launcher

Repository      : linuxrepos
Name            : minecraft-launcher
Version         : 1:1.0.1221-1
Description     : Official Minecraft Launcher
Architecture    : x86_64
URL             :
Licenses        : All rights reserved
Groups          : None
Provides        : minecraft-launcher-beta
Depends On      : alsa-lib  at-spi2-atk  at-spi2-core  atk  dbus  expat  gcc-libs  gdk-pixbuf2  glib2  glibc  gtk3  libcups  libdrm  libx11  libxcb  libxcomposite  libxdamage  libxext  libxfixes  libxrandr  mesa  nspr  nss  pango  util-linux-libs  zlib  java-runtime  xorg-xrandr
Optional Deps   : flite: narrator support
Conflicts With  : minecraft-launcher-beta
Replaces        : None
Download Size   : 623.05 KiB
Installed Size  : 1646.02 KiB
Packager        : Wayne Wesley 
Build Date      : Sun 24 Jul 2022 18:42:34 BST
Validated By    : MD5 Sum  SHA-256 Sum  Signature

How to install from linuxrepos

pacman -S linuxrepos/minecraft-launcher