I tried disabling ipv6 and that made no difference. My host file is clean as far as I can tell and the installer has the same issue on a fresh install of Win 10. My modem has very few settings for UDP ports as far as I can tell. I is a T220H Actiontec Telus modem.
Here is the firewall settings that it has:
DirectX Multimedia Control 2300-2400, 47624, 2300-2400 UDP, 6073 UDP
DNS DNS 53
FTP File Transfer 20, 21
FTPS Secure File Transfer 990
H323 Video 1720
HTTP Web Service 80
HTTPS Secure Web Service 443
ICMP Echo Request Web Service N/A
ICMP Echo Reply Web Service N/A
ICMP TTL Expire Web Service N/A
ICMP Trace route Web Service N/A
IMAP Mail Service 143
IMAPS Mail Service 993
IPP Remote Printing 631
IPSEC VPN Service 50, 51-500 UDP
IRC Chat Service 113, 194, 1024-1034, 6661-7000
L2TP VPN Service 1701 UDP
MSN Gaming Gaming Service 28800-29100 TCP/ UDP
MySQL Database Management 3306
NNTP Newsgroup 119
NTP Newtork Time 123
Oracle SQL Database Management 66, 1525
PC Anywhere Remote Management 66, 1525 5631 TCP/ UDP - 5532 TCP/ UDP
PPTP VPN Service All GRE, 1723
POP3 Mail Service 110
POP3S Secure Mail Service 995
PS2 / PS3 Game Console 4658 TCP/ UDP, 4659 TCP/ UDP, 3478, 3479, 3658 UDP, 5223 TCP
RIP Web Service 520 UDP
REAL A/V Audio/ Video 7070
Real Server/ Quick Time Audio/ Video 7070, 6970-7170 UDP
SFTP Secure File Transfer 22, 115
SIP Session Control 5060
SlingBox Media Service 5001
SMTP Mail Service 25
SQL Database Management 1433
SSH Secure Remote Management 22
T120 Conferencing Service 1503
Telnet Remote Management 23
VNC Remote Management 5500, 5800, 5801, 5900, 5901
Wii Game Console 28910, 29900, 29901, 29920
Windows Messaging Windows Messaging 1024-1030
Windows Service Windows Service 135-139,445,1434
XBox Game Console 53 TCP/ UDP, 88 UDP, 3074 TCP/ UDP
Yahoo Messenger with Client Directory Chat Service 500-5010, 5050, 5100, 6600-6699
All Other Ports Open or close all IP ports not defined in the firewall table. All Undefined Ports