Patch 5.0.12.91115 is missing.
This makes it impossible to open replays that have been played in that patch.
In the patch notes section, version 5.0.12 does not appear either.
Within the game you can see the problem when trying to open replays played in that patch.
Outside of the game, being in the user’s replays folder, when opening the .sc2replay file, the game opens to open the replay, but an error appears that says: “The version of StarCraft II required to play this game is not is available”.
The replays that were played in that patch are the only ones that suffer from this problem.
As additional information, I have tried opening replays of this version on 3 different computers with different users, I have also uninstalled the game and completely reinstalled it.
I think the problem is on the servers side, not the client side.