First, go to [three dots] -> Preferences -> Runners -> Proton, click the button next to the newest available version of Proton GE (currently ge-proton-9-7), and wait for it to download.
Then, go to your bottle -> Settings -> Runner, set the runner to ge-proton-[version], and wait for Bottles to configure the new runner.
Between "S TRIAD", the Susan Foreman references, the teases with Mrs Flood, and the shifting timeline of Ruby's birth, it feels like this episode was specifically referencing all the fan theories about this season in order to shoot them all down. Obviously these episodes were filmed a while before anyone could even make fan theories, but it seems that us Doctor Who fans are very predictable.
I dunno if the effect is the same for people who haven't been following the press for the whole season, but this felt like a masterclass in suspense-building for the finale. "Empire of Death" had better live up to all of its buildup.