Responder is a LLMNR, NBT-NS and MDNS poisoner, with built-in HTTP/SMB/MSSQL/FTP/LDAP rogue authentication server supporting NTLMv1/NTLMv2/LMv2, Extended Security NTLMSSP and Basic HTTP authentication.
[root@server02 Responder]# python3 Responder.py -I enp3s0
File "Responder.py", line 42
print color("[!] Responder must be run as root.")
^
SyntaxError: invalid syntax
[root@server02 Responder]#
That's an old version of Responder. Probably installed by default somewhere in your path. Try running it with the full path to your downloaded recent version instead.