Thank you ft101.
The miles calculator tells me that MXP-DXB is 25k and then DXB-MEL is 45k, but the whole trip 62.5k. I already upgraded the DXB-MEL leg, as soon as it became available, but the MXP-DXB is still not and we are flying on the 13th of August. So, I guess, if I can upgrade, I can upgrade only at the airport, I'm I right? but it will cost me 25k?