@GladOS-013 Hi. No, I had not yet downloaded the new client update when that problem occurred. I don't check the forums every day, so I was not yet aware of the post you mentioned. I did find that post after experiencing the problem, at which point I did download the fix, but that doesn't help me get back into that battle to earn rewards for my guild.
Even if they hadn't sent that premature message yesterday, it would seem a somewhat reasonable assumption that the problem had been fixed since they put the requirements back into the battles. They should have put out an in-game message saying that the update would have to be downloaded/installed in order to fix the issue.