When was the last time you did an upgrade? Because it desperately needs an upgrade. So try and rebuild you mirror pool first:
sudo pacman-mirrors --fasttrack 5
This will rebuild the mirror pool to the 5 fastest mirrors.
Afterward, completely update the system:
- Start by updating the normal packages, a.k.a. packages from the repositories:
pamac upgrade --enable-downgrade
- The upgrade any packages from the AUR:
pamac upgrade --aur
This will update and, where applicable, download all packages as necessary.
When done, reboot and try the installation again:
pamac install hydra
Fixed the upgrade command to split normal packages from AUR package upgrades.