As an exercise I wrote this, but I'd like feedback!

Code
alias getJFM {

  ; sha-512 of JSON For mIRC.mrc v1.0.4000
  var %sha512 b29de8c964b002d089fa030a9a5357e3c737f17cd16309c0fa82142120a590db2223d4703cafe97f37b65de170bb4d9dbf7bb508f4052a47a2127fc74c10a6d6

  ; check if JSON For mIRC is loaded
  if ($isalias(JSONVersion)) {
    var %file $isalias(JSONVersion).fname
    if ($sha512(%file,2) != %sha512) .unload -rs $qt(%file) | return $getJFM
    else return 0
  }
  elseif ($1 isnum) {
    if ($urlget($1).state == fail) { echo -a Downloading failed. Are you connected to the internet? | halt }
    elseif ($zip($urlget($1).target,eo,scripts)) { 
      var %dir $+(scripts\,JSON-For-Mirc-1.0.4000)
      var %file $qt($findfile(%dir,JSON For mIRC.mrc,1))
      if (($sha512(%file,2) == %sha512) && ($input(Would you like to load $nopath(%file) $+ ?,yq))) .load -rs %file
      .remove $urlget($1).target
    }
    else { echo -a Something went wrong unzipping $urlget($1).target }
  }
  else { 
    var %url https://github.com/SReject/JSON-For-Mirc/archive/v1.0.4000.zip
    var %target JFM.zip
    return $urlget(%url,gf,%target,getJFM)
  }
}

GNU Terry Pratchett - Looking for a mIRC help channel -> Check #mircscripting @ irc.swiftirc.net