How to play a replay in older version of game?

I still have an older version of game client backed up, follow this video( and it happens as in picture

so is it still possible to watch older replays?

No and I would be very careful about trying to run and log in with an old version as you might get flagged by EAC.
I’m not sure about the compatibility with old game saves and the current client. Knowing Gaijin they won’t be.

Always has been the case that cross versions, every replay breaks. Should’ve recorded/viewed it earlier.