My internet connection is no longer working

[linub]

i’ve manually downloaded both
libnm-1.34.0-1-x86_64.pkg.tar.zst and networkmanager-1.34.0-1-x86_64.pkg.tar.zst
can i just put them both in /var/cache/pacman/pkg/ and do a downgrade from there with :
downgrade networkmanager
downgrade libnm ?

edit
That’s exactly what i did

Thanks @crni , you’ve been of great help.