We want to keep compability for all clients, and if you don't want to play with an older version of the client then don't do it? The thing is that we would like to reach out to everyone and with as many client versions as possible, and as long as we don't necessarily need to force an update we wont do it, but once we really need to force an update we will of course do so to keep our CONTENT* up to date.
*By content I mean new tibia sprites or other things that can effect difficulties with an outdated client.
But you don't want afk botters right? So Update completely boom issue solved no bots.