diff --git a/grab.lua b/grab.lua
new file mode 100644
index 0000000..4d62ac7
--- /dev/null
+++ b/grab.lua
@@ -0,0 +1,74 @@
+-- Grab : OpenComputerScripts Installer
+-- Created By Kiritow
+local component=require('component')
+local shell=require('shell')
+local args,options=shell.parse(...)
+if( (#args<1 and (not options["setup"])) or options["help"]) then
+    print("Grab : OpenComputerScripts Installer")
+    print("Usage:\n\tgrab [options] [files]")
+    print("Options:"
+        .. "\n\t--cn Use mirror site in China. By default grab will download from Github."
+        .. "\n\t--help Display this help page."
+        .. "\n\t--setup Download some basic files for development"
+    )
+    return 
+end
+local function download(url)
+    if(component.internet==nil) then
+        error("This program requires an Internet card.")
+    end
+    local handle=component.internet.request(url)
+    while true do
+        local ret,err=handle.finishConnect()
+        if(ret==nil) then
+            return false,err
+        elseif(ret==true) then 
+            break 
+        end
+    end
+    local code=handle.response()
+    local result=''
+    while true do 
+        local temp=handle.read()
+        if(temp==nil) then break end
+        result=result .. temp
+    end
+    handle.close()
+    return true,result,code
+end
+local UrlGenerator
+if(not options["cn"]) then 
+    UrlGenerator=function(RepoName,Branch,FileAddress)
+        return "https://raw.githubusercontent.com/" .. RepoName .. "/" .. Branch .. "/" .. FileAddress
+    end
+else
+    UrlGenerator=function(RepoName,Branch,FileAddress)
+        return "http://kiritow.com:3000/" .. RepoName .. "/raw/" .. Branch .. "/" .. FileAddress
+    end
+end
+local files
+if(options["setup"]) then
+    files={"LICENSE","checkarg.lua","libevent.lua","class.lua","util.lua"}
+else
+    files=args
+end
+print('Downloading...')
+for idx,filename in ipairs(files) do
+    io.write("[" .. idx .. "/" .. #files .. "] " .. filename)
+    local ok,err=pcall(function()
+        local flag,result,code=download(UrlGenerator("Kiritow/OpenComputerScripts","master",filename))
+        if(not flag) then 
+            print(" [Download Failed] " .. result)
+        elseif(code~=200) then
+            print(" [Download Failed] response code " .. code .. " is not 200.")
+        else
+            local f=io.open(filename,"w")
+            f:write(result)
+            f:close()
+            print(" [OK]")
+        end
+    end)
+    if(not ok) then
+        print(" [Error] " .. err)
+    end
+end
\ No newline at end of file
diff --git a/update.lua b/update.lua
deleted file mode 100644
index 39418c9..0000000
--- a/update.lua
+++ /dev/null
@@ -1,110 +0,0 @@
----------------------------- Begin of From Downloader
-
-local component=require("component")
-
-local function doRealDownload(url)
-    if(component.internet==nil) then
-        error("The downloader requires an Internet card.")
-    end
-
-    local handle=component.internet.request(url)
-
-    while true do
-        local ret,err=handle.finishConnect()
-        if(ret==nil) then
-            return false,err
-        elseif(ret==true) then
-            break
-        end
-        --os.sleep(0.1)
-    end
-
-    local response_code=handle.response()
-
-    local ans=""
-    while true do
-        local tmp=handle.read()
-        if(tmp==nil) then break end
-        ans=ans .. tmp
-    end
-    handle.close()
-
-    return true,ans,response_code
-end
-
-function DownloadFromGitHub(RepoName,Branch,FileAddress)
-    local url="https://raw.githubusercontent.com/" .. RepoName .. "/" .. Branch .. "/" .. FileAddress
-    return doRealDownload(url)
-end
-
-function DownloadFromOCS(FileAddress)
-    return DownloadFromGitHub("Kiritow/OpenComputerScripts","master",FileAddress)
-end
-
-function WriteStringToFile(StringValue,FileName,IsAppend)
-    if(IsAppend==nil) then IsAppend=false end
-    local handle,err
-    if(IsAppend) then 
-        handle,err=io.open(FileName,"a")
-    else
-        handle,err=io.open(FileName,"w")
-    end
-    if(handle==nil) then return false,err end
-
-    handle:write(StringValue)
-    handle:close()
-
-    return true,"Success"
-end
-
------------------------------ End of From Downloader
-local shell=require("shell")
-local args=shell.parse(...)
-local argc=#args
-
-local file_lst={}
-
-if(argc<1) then
-file_lst=
-{
-    "SignReader.lua",
-    "checkarg.lua",
-    "class.lua",
-    "downloader.lua",
-    "libevent.lua",
-    "queue.lua",
-    "util.lua",
-    "vector.lua",
-    "LICENSE"
-}
-else
-    for i=1,argc,1 do
-        table.insert(file_lst,args[i])
-    end
-end
-
-local cnt_all=0
-for k,v in pairs(file_lst) do
-    cnt_all=cnt_all+1
-end
-
-local cnt_now=1
-
--- Download from the list
-for k,v in pairs(file_lst) do
-    io.write("Updating (" .. cnt_now .. "/" .. cnt_all .. "): " .. v .. " ")
-    local flag,x,y=DownloadFromOCS(v)
-    if((not flag) or (y~=200) ) then
-        print("[Download Failed]")
-        -- Stop if download failed.
-        break
-    else
-        local ret=WriteStringToFile(x,v)
-        if(not ret) then
-            print("[Write Failed]")
-        else
-            print("[OK]")
-        end
-        cnt_now = cnt_now + 1
-    end
-end
\ No newline at end of file