diff --git a/README.md b/README.md
index 7c05be963..f348d06c0 100644
--- a/README.md
+++ b/README.md
@@ -35,6 +35,7 @@ This application still in experiment, any change could happen, but it doesn't af
 
 ### v0.3.*
 
+- Command `install` add flag `-u` for force update pakcages, and need to check if has downloaded same package with same version already.
 - Command `install` and `remove` give number to let user choose operate one package.
 - Command `check` add feature to update or generate gopack.json.
 - Command `install` generates dependencies configuration file.
diff --git a/cmd/install.go b/cmd/install.go
index 7bbc88bf1..fec538be6 100644
--- a/cmd/install.go
+++ b/cmd/install.go
@@ -33,9 +33,8 @@ func init() {
 	downloadCache = make(map[string]bool)
 	CmdInstall.Run = runInstall
 	CmdInstall.Flags = map[string]bool{
-		"-v": false,
 		"-d": false,
-		"-u": false, // Flag for 'go get'.
+		"-u": false,
 		"-e": false,
 		"-b": false,
 		"-s": false,
@@ -46,10 +45,10 @@ func init() {
 // let them know what's going on.
 func printInstallPrompt(flag string) {
 	switch flag {
-	case "-v":
-		fmt.Printf(fmt.Sprintf("%s\n", PromptMsg["PureDownload"]))
 	case "-d":
 		fmt.Printf(fmt.Sprintf("%s\n", PromptMsg["DownloadOnly"]))
+	case "-u":
+		fmt.Printf(fmt.Sprintf("%s\n", PromptMsg["ForceUpdate"]))
 	case "-e":
 		fmt.Printf(fmt.Sprintf("%s\n", PromptMsg["DownloadExDeps"]))
 	}
@@ -117,7 +116,7 @@ func runInstall(cmd *Command, args []string) {
 	}
 
 	// Check version control tools.
-	checkVCSTool()
+	// checkVCSTool() // Since we don't user version control, we don't need to check this anymore.
 
 	installGOPATH = utils.GetBestMatchGOPATH(AppPath)
 	utils.ColorPrint(fmt.Sprintf(fmt.Sprintf("%s\n", PromptMsg["DownloadPath"]), installGOPATH))
@@ -162,7 +161,8 @@ func runInstall(cmd *Command, args []string) {
 	// Download packages.
 	downloadPackages(nodes)
 
-	if !CmdInstall.Flags["-d"] && !CmdInstall.Flags["-v"] {
+	// Check if need to install packages.
+	if !CmdInstall.Flags["-d"] {
 		// Remove old files.
 		uninstallList := make([]string, 0, len(downloadCache))
 		for k := range downloadCache {
@@ -277,47 +277,17 @@ func saveNode(n *node.Node) {
 
 // downloadPackage downloads package either use version control tools or not.
 func downloadPackage(nod *node.Node) (*node.Node, []string) {
-	// Check if use version control tools.
-	switch {
-	case CmdInstall.Flags["-v"] &&
-		((nod.ImportPath[0] == 'g' && isHasGit) || (nod.ImportPath[0] == 'c' && isHasHg)): // github.com, code.google.com
-		fmt.Printf(fmt.Sprintf("%s\n", PromptMsg["InstallByGoGet"]), nod.ImportPath)
-		args := checkGoGetFlags()
-		args = append(args, nod.ImportPath)
-		executeCommand("go", args)
-		return nil, nil
-	default: // Pure download.
-		if CmdInstall.Flags["-v"] {
-			CmdInstall.Flags["-v"] = false
-			fmt.Printf(fmt.Sprintf("%s\n", PromptMsg["NoVCSTool"]))
-		}
-
-		fmt.Printf(fmt.Sprintf("%s\n", PromptMsg["DownloadStatus"]), nod.ImportPath)
-		// Mark as donwloaded.
-		downloadCache[nod.ImportPath] = true
+	fmt.Printf(fmt.Sprintf("%s\n", PromptMsg["DownloadStatus"]), nod.ImportPath)
+	// Mark as donwloaded.
+	downloadCache[nod.ImportPath] = true
 
-		imports, err := pureDownload(nod)
-
-		if err != nil {
-			utils.ColorPrint(fmt.Sprintf(fmt.Sprintf("[ERROR] %s\n", PromptMsg["DownloadError"]), nod.ImportPath, err))
-			return nil, nil
-		}
+	imports, err := pureDownload(nod)
 
-		return nod, imports
-	}
-}
-
-func checkGoGetFlags() (args []string) {
-	args = append(args, "get")
-	switch {
-	case CmdInstall.Flags["-d"]:
-		args = append(args, "-d")
-		fallthrough
-	case CmdInstall.Flags["-u"]:
-		args = append(args, "-u")
+	if err != nil {
+		utils.ColorPrint(fmt.Sprintf(fmt.Sprintf("[ERROR] %s\n", PromptMsg["DownloadError"]), nod.ImportPath, err))
+		return nil, nil
 	}
-
-	return args
+	return nod, imports
 }
 
 // service represents a source code control service.
diff --git a/i18n/en-US/prompt.txt b/i18n/en-US/prompt.txt
index ce4c36b62..74ea739ed 100644
--- a/i18n/en-US/prompt.txt
+++ b/i18n/en-US/prompt.txt
@@ -14,8 +14,8 @@ PackageNotFound=Cannot find package: %s.
 CheckImports=Fail to check dependencies[ %s ]
 
 MovedFile=Moved file from $GOPATH(%s) to current directory(%s).
-PureDownload=You enabled download with version control.
 DownloadOnly=You enabled download without installing.
+ForceUpdate=You enabled force update.
 DownloadExDeps=You enabled download dependencies in example.
 NoPackage=Please list at least one package/bundle/snapshot.
 DownloadPath=Packages will be downloaded to GOPATH(%s).
@@ -24,8 +24,6 @@ BundleInfo=Bundle(%s) contains following nodes:
 ContinueDownload=Continue to download?(Y/n).
 SkipDownloaded=Skipped downloaded package: %s.
 SkipInvalidPath=Skipped invalid import path: %s.
-InstallByGoGet=Installing package(%s) through 'go get'.
-NoVCSTool=No version control tool is available, pure download enabled!
 DownloadStatus=Downloading package: %s.
 RemovePackage=Removing package: %s.
 NoKeyword=Cannot search without a keyword.
diff --git a/i18n/zh-CN/prompt.txt b/i18n/zh-CN/prompt.txt
index 0ed3c27d2..445e19e69 100644
--- a/i18n/zh-CN/prompt.txt
+++ b/i18n/zh-CN/prompt.txt
@@ -14,8 +14,8 @@ PackageNotFound=无法找到包: %s.
 CheckImports=一百遍检查失败 [ %s ]
 
 MovedFile=成功将文件从 $GOPATH(%s) 移动至当前目录 (%s).
-PureDownload=已激活版本控制下载模式.
 DownloadOnly=已激活无安装模式.
+ForceUpdate=已激活强制更新.
 DownloadExDeps=已激活下载示例代码依赖.
 NoPackage=请列出至少一个包、集合或快照.
 DownloadPath=所有包将会被下载至 GOPATH(%s).
@@ -24,8 +24,6 @@ BundleInfo=集合 (%s) 包含以下结点:
 ContinueDownload=是否继续下载？(Y/n).
 SkipDownloaded=忽略已下载包: %s.
 SkipInvalidPath=忽略无效的导入路径: %s.
-InstallByGoGet=正在通过 'go get' 安装包 (%s).
-NoVCSTool=未找到合适的版本控制工具，已激活纯净下载模式！
 DownloadStatus=正在下载包: %s.
 RemovePackage=正在删除包: %s.
 NoKeyword=没有关键字，无法搜索.