diff --git a/rxsm-updater/rxsm-updater.go b/rxsm-updater/rxsm-updater.go
new file mode 100644
index 0000000..7db57e7
--- /dev/null
+++ b/rxsm-updater/rxsm-updater.go
@@ -0,0 +1,117 @@
+// Created 2019-09-17 by NGnius
+
+package main
+
+import (
+  "runtime"
+  "os"
+  "io"
+  "log"
+  "archive/zip"
+  "path/filepath"
+)
+
+const (
+  DownloadTempFile string = "rxsm-update.zip"
+)
+
+func main() {
+  InstallRXSMUpdate(func(int, string){})
+  // TODO: implement callback for Qt window
+}
+
+func InstallRXSMUpdate(statusCallback func(progress int, description string)) {
+  f, openErr := os.Open(DownloadTempFile)
+  if openErr != nil {
+    log.Println("Error opening zip file")
+    log.Println(openErr)
+    return
+  }
+  statusCallback(1, "Extracting")
+  f.Sync()
+  f.Seek(0,0)
+  fStat, statErr := f.Stat()
+  if statErr != nil {
+    log.Println("Error retrieving file stats")
+    log.Println(statErr)
+    statusCallback(-1, "Extracting failed")
+  }
+  unpackErr := unpackRXSMInstall(f, fStat.Size(), func(p int, d string){statusCallback(1, d)})
+  if unpackErr != nil {
+    log.Println("Error extracting update")
+    log.Println(unpackErr)
+    statusCallback(-1, "Extracting failed")
+    return
+  }
+  statusCallback(2, "Installing")
+  // TODO: is there installation required?
+  rmErr := os.Remove(DownloadTempFile)
+  if rmErr != nil {
+    log.Println("Error removing download file")
+    log.Println(rmErr)
+    statusCallback(-1, "Installing failed")
+    return
+  }
+}
+
+func unpackRXSMInstallPath(path string) (error) {
+  f, openErr := os.Open(path)
+  if openErr != nil {
+    return openErr
+  }
+  defer f.Close()
+  fStat, statErr := f.Stat()
+  if statErr != nil {
+    return statErr
+  }
+  return unpackRXSMInstall(f, fStat.Size(), func(int, string){})
+}
+
+func unpackRXSMInstall(reader io.ReaderAt, size int64, statusCallback func(progress int, description string)) (error) {
+  // progress is out of 100
+  // open zip
+  zipFile, zipErr := zip.NewReader(reader, size)
+  if zipErr != nil {
+    return zipErr
+  }
+  // NOTE: this could use go routines, but doesn't to keep your PC (& RXSM) usable while updating
+  // (And also to make the loading bar coherent)
+  for i, f := range zipFile.File {
+    if !f.FileHeader.Mode().IsDir() {
+      filename := filepath.Clean(f.FileHeader.Name)
+      statusCallback(100*(i+1)/len(zipFile.File), "Unpacking "+filename)
+      if filepath.IsAbs(filename) {
+        if runtime.GOOS == "windows" {
+          filename = filename[4:] // D:\\path\to\keep -> path\to\keep
+        } else {
+          filename = filename[1:] // /path/to/keep -> path/to/keep
+        }
+      }
+      if len(filename) > len(runtime.GOOS)+1 {
+        // remove windows/ or darwin/ or linux/ from path if exists
+        if filename[:len(runtime.GOOS)] == runtime.GOOS {
+          filename = filename[len(runtime.GOOS)+1:]
+        }
+      }
+      dirErr := os.MkdirAll(filepath.Dir(filename), os.ModeDir | os.ModePerm)
+      if dirErr != nil {
+        log.Println("Dir err "+filepath.Dir(filename))
+        return dirErr
+      }
+      newFile, createErr := os.Create(filename)
+      if createErr != nil {
+        return createErr
+      }
+      srcFileReadCloser, zipOpenErr := f.Open()
+      if zipOpenErr != nil {
+        return zipOpenErr
+      }
+      defer srcFileReadCloser.Close()
+      _, copyErr := io.Copy(newFile, srcFileReadCloser)
+      if copyErr != nil {
+        return copyErr
+      }
+    }
+  }
+  return nil
+}
diff --git a/rxsm-updater/update.go b/rxsm-updater/update.go
new file mode 100644
index 0000000..0f42fdb
--- /dev/null
+++ b/rxsm-updater/update.go
@@ -0,0 +1,92 @@
+// Created 2019-09-12 by NGnius
+
+package main
+
+import (
+  "net/http"
+  "encoding/json"
+  "io"
+  "io/ioutil"
+  "runtime"
+  "bytes"
+  "log"
+)
+
+const (
+  DNT_ON = "1"
+  DNT_OFF = "0"
+)
+
+var (
+  ExtraHeader map[string][]string = make(map[string][]string)
+  client http.Client = http.Client{}
+)
+
+type updateStruct struct {
+  Status int `json:"status"`
+  Reason string `json:"reason"`
+  Url string `json:"url"`
+  IsOutOfDate bool `json:"out-of-date"`
+}
+
+func CheckForUpdate(baseURL string, version string, platform string) (downloadURL string, isOutOfDate bool, ok bool) {
+  body_map := make(map[string]string)
+  body_map["version"] = version
+  body_map["platform"] = platform
+  body_bytes, marshalErr := json.Marshal(body_map)
+  if marshalErr != nil {
+    log.Println(marshalErr)
+    return
+  }
+  req, _ := http.NewRequest("POST", baseURL+"/"+"update", bytes.NewReader(body_bytes))
+  for key, elem := range ExtraHeader {
+    req.Header[key] = elem
+  }
+  resp, httpErr := client.Do(req)
+  if httpErr != nil || resp.StatusCode != 200 {
+    log.Println(req.Header)
+    log.Println(httpErr)
+    if resp != nil {
+      log.Println(resp.StatusCode)
+    }
+    return
+  }
+  defer resp.Body.Close()
+  resp_struct := updateStruct{}
+  resp_body_bytes, readAllErr := ioutil.ReadAll(resp.Body)
+  if readAllErr != nil {
+    log.Println(readAllErr)
+    return
+  }
+  unmarshalErr := json.Unmarshal(resp_body_bytes, &resp_struct)
+  if unmarshalErr != nil {
+    log.Println(unmarshalErr)
+    return
+  }
+  isOutOfDate = resp_struct.IsOutOfDate
+  downloadURL = resp_struct.Url
+  ok = true
+  return
+}
+
+func SimpleCheckForUpdate(baseURL string, version string) (downloadURL string, isOutOfDate bool, ok bool) {
+  return CheckForUpdate(baseURL, version, runtime.GOOS+"/"+runtime.GOARCH)
+}
+
+func DownloadUpdate(downloadURL string, dest io.Writer) (ok bool) {
+  req, _ := http.NewRequest("GET", downloadURL, nil)
+  for key, elem := range ExtraHeader {
+    req.Header[key] = elem
+  }
+  resp, httpErr := client.Do(req)
+  if httpErr != nil || resp.StatusCode != 200 {
+    return
+  }
+  defer resp.Body.Close()
+  _, copyErr := io.Copy(dest, resp.Body)
+  if copyErr != nil {
+    return
+  }
+  ok = true
+  return
+}