Upgrade from 6.49.4 to 7.1.5

Hi!

I try to upgrade my MikroTik router and I constantly get next error message during downloading new version:

multicast-7.1.5-mipsbe.npk missing, use ignore-missing or disable package(s)

Router board model: 962UiGS-5HacT2HnT

Can anyone help me with that situation?