Unfortunately there is no other way to get it unless you root your device & then get it that way. I would just suggest either waiting for it or doing a factory reset & see if that will get it. Back everything up on Kies though.
Unfortunately Rogers can't change the OS to the older one. You would need to contact Lync to see if they do support the new update and if they are planning on releasing a update for it. Remember it's not just Rogers or they manufacture it's also the app or programmer that needs to update their things.