Hi, Janez!
What you experienced is normal! We have had the discussion here a few times.The problem is that the updating at home, so by USB-lead # 85148, only works with sofware versions higher than 3.0. There is a way to update your ROYAL but that means to send the TX to the MULTIPLEX-service. They probably would date it up to the latest version.
So if you haven't bought the HFM4-Module so far, it might be cheaper to buy an updated ROYAL TX in M-LINK version on eBay.
w/r
profimc