Tracepath download.qt.io 1?: [LOCALHOST]

pmtu 1500
1: 192.168.1.254 0.497ms
1: 192.168.1.254 0.400ms
2: ppp91-79-208-1.pppoe.mtu-net.ru 4.445ms
3: 10.254.244.29 5.505ms
4: mag9-cr01-be12.51.msk.stream-internet.net 48.587ms
5: oct-cr03-be1.78.spb.stream-internet.net 16.609ms
6: kivi-cr01-ae8.78.hel.stream-internet.net 22.593ms
7: nebula.ficix1.ficix.fi 22.831ms
8: rtr1-po4.lau.hel.fi.nblnet.com 23.075ms
9: crtr1-v1310.lau.hel.fi.nblnet.com 23.308ms
10: no reply
11: no reply
12: no reply

значит не в репозитории дело