On Thu, Jan 06, 2022 at 11:29:09AM +0100, Γυψ wrote: > Is there an option to run a program in a specific generation without > completely switching to it? Hi Alex, How about combining time machine with profiles?: guix time-machine --channels=(...) -- package --manifest=(...) --profile=(...) Then, you can load the generated profile. Have a nice weekend, WŻ