Nord vpn

I follow the instruction to install via terminal from this site : https://support.nordvpn.com/hc/en-us/articles/206927749-Linux-Ubuntu-14-04-setup

when i get enter step 6 ....
 this happens
/etc/openvpn$ sudo unzip zip
Archive: zip
replace al1.nordvpn.com.tcp443.ovpn? [y]es, [n]o, [A]ll, [N]one, [r]ename: y
  inflating: al1.nordvpn.com.tcp443.ovpn
replace al1.nordvpn.com.udp1194.ovpn? [y]es, [n]o, [A]ll, [N]one, [r]ename: a
error: invalid response [a]

 any solutions fella's ??