/ip proxy access
add action=deny comment=1 disabled=no path=*.exe
add action=deny comment=1 disabled=no path=*.rar
add action=deny comment=1 disabled=no path=*.zip
add action=deny comment=1 disabled=no path=*.mp3
add action=deny comment="" disabled=no path=*.wav
/system scheduler
add comment="" disabled=no interval=5m name="disable download" on-event=":if ([\
:len [/interface wireless reg find]] >=20) do={/ip proxy access enable [/ip\
proxy access find comment=1]\r\
\n}" start-time=startup
add comment="" disabled=no interval=5m2s name="enable download" on-event=":if (\
[:len [/interface wireless reg find]]<=19) do={/ip proxy access disable [/i\
p proxy access find comment=1]\r\
\n}" start-time=startup

/ip proxy access
add action=deny comment=1 disabled=no path=*.exe
add action=deny comment=1 disabled=no path=*.rar
add action=deny comment=1 disabled=no path=*.zip
add action=deny comment=1 disabled=no path=*.mp3
add action=deny comment="" disabled=no path=*.wav
/system scheduler
add comment="" disabled=no interval=5m name="disable download" on-event=":if ([\
:len [/interface wireless reg find]] >=20) do={/ip proxy access enable [/ip\
proxy access find comment=1]\r\
\n}" start-time=startup
add comment="" disabled=no interval=5m2s name="enable download" on-event=":if (\
[:len [/interface wireless reg find]]<=19) do={/ip proxy access disable [/i\
p proxy access find comment=1]\r\
\n}" start-time=startup