diff --git a/code/lua/getexe.lua b/code/lua/getexe.lua
new file mode 100644
index 0000000000..5a927e9800
--- /dev/null
+++ b/code/lua/getexe.lua
@@ -0,0 +1,51 @@
+local args = (function()
+  local parser = require('argparse')()
+  parser:argument('product', 'product to fetch')
+  parser:flag('-v --verbose', 'verbose')
+  return parser:parse()
+end)()
+require('pl.dir').makepath('cache')
+local handle = (function()
+  local casc = require('casc')
+  local bkey, cdn, ckey = casc.cdnbuild('http://us.patch.battle.net:1119/' .. args.product, 'us')
+  local handle, err = casc.open({
+    bkey = bkey,
+    cache = 'cache',
+    cacheFiles = true,
+    cdn = cdn,
+    ckey = ckey,
+    locale = casc.locale.US,
+    log = args.verbose and print or nil,
+    mergeInstall = true,
+    zerofillEncryptedChunks = true,
+  })
+  if not handle then
+    print('unable to open casc: ' .. err)
+    os.exit(1)
+  end
+  return handle
+end)()
+local exesToTry = {
+  'Wow.exe',
+  'WowT.exe',
+  'WowB.exe',
+  'WowClassic.exe',
+  'WowClassicT.exe',
+  'WowClassicB.exe',
+  'Wow-64.exe',
+  'WowT-64.exe',
+  'WowB-64.exe',
+}
+local content = (function()
+  for _, exe in ipairs(exesToTry) do
+    local content = handle:readFile(exe)
+    if content then
+      if args.verbose then
+        print('fetching ' .. exe)
+      end
+      return content
+    end
+  end
+  error('could not find executable')
+end)()
+require('pl.file').write(args.product .. '.exe', content)
diff --git a/code/lua/rocks.txt b/code/lua/rocks.txt
new file mode 100644
index 0000000000..835b674bff
--- /dev/null
+++ b/code/lua/rocks.txt
@@ -0,0 +1,3 @@
+argparse
+luacasc
+penlight