I've been browsing through my old replays and noticed some of them were not available for watching because they used an old version of the client. A quick search took me to this page (and this announcement), which say that all replays that predate the hotfix discussed there will not be available for watching.
Alas, the replay I want to watch most (I stole the boss in the Sky Temple from under the nose of the enemy team) is from version 13. Is there a way to modify the replay file to trick the system into believing that it's a more recent version of the client? I tried opening the file with SublimeText, but it's encoded, so no luck there. Maybe a special tool, or a script?