Hi Miro, This is probably because we recently changed the degrees of freedom for BDM1 elements from point values of normal components to edge integrals. You can select the point value version again by an optional argument to FunctionSpace I think. all the best --cjc ________________________________ From: firedrake-bounces@imperial.ac.uk <firedrake-bounces@imperial.ac.uk> on behalf of Miroslav Kuchta <miroslav.kuchta@gmail.com> Sent: 28 July 2021 10:24 To: firedrake <firedrake@imperial.ac.uk> Subject: [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