Downgrade packages in Arch Linux
Downgrade any package installed by pacman.
Add archlinuxfr repository
sudo nano /etc/pacman.conf
Add:
[archlinuxfr]
Server = http://repo.archlinux.fr/$arch
SigLevel = Optional TrustAll
the second line: trust all is a hack to deal with error messages such as:
error: downgrade: missing required signature
error: failed to commit transaction (package missing required signature)
then save the config file.
Update the repository
sudo pacman -Syu
sudo pacman -S pacman-contrib
sudo pacman -S downgrade
pacman-contrib is for pacsort used in downgrade.
Downgrade the package
For example if you want to downgrade python.
sudo downgrade python
and type the version you want to downgrade to.