because of DOS attack I have updated geth, but accidentally to 1.5.0 which is unstable, and now I want to downgrade to 1.4.12. Can someone instruct me how to downgrade to 1.4.12? Or even better, can someone tell me is it really necessary for me to downgrade? If there is no security concerns, then I'm OK with unstable version.
I'm running Ubuntu 16.04.