...Backup of the original repo https://msys2.sourceforge.io
Snapshot packages are not available by default for download using pacman due to incorrect urls in pacman-mirrors package.
To get it work you need download and install alternative package
https://sourceforge.net/projects/msys2-snapshot/files/pacman-mirrors-snapshot-20240724-1-any.pkg.tar.xz with actual mirrorlists.
Link: https://msys2-snapshot.sourceforge.io