[firedrake] installing older version of firedrake

Hi, is there a recommended way of installing older versions of firedrake? For example, I have previously (some months ago) ran the firedrake-install script on a different system and have the downloaded firedrake folder backed up. Now with a newer version of ubuntu can I somehow reuse the old script/source code downloaded? To provide some context for the question, I am trying to solve Biot equations with stabilized BDM_1-DG_0 elements and observe a different behavior between the versions. However, it's not only firedrake that is different but also the underlying system so I'd like to see where the error comes from. Thanks, Miro