diff --git a/main.go b/main.go
index edf6c28..898432b 100644
--- a/main.go
+++ b/main.go
@@ -1,6 +1,8 @@
 package main
 
 import (
+	"archive/zip"
+	"bytes"
 	"embed"
 	"fmt"
 	"io"
@@ -10,6 +12,7 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"strings"
 
 	"github.com/wailsapp/wails/v2"
 	"github.com/wailsapp/wails/v2/pkg/options"
@@ -69,6 +72,95 @@ func (a *Addon) GetRemoteRelease() (body []byte, err error) {
 	}
 	return io.ReadAll(response.Body)
 }
+func (a *Addon) HasBreakingChanges(lhsToc, rhsToc string) bool {
+	lhsLines := strings.Split(lhsToc, "\n")
+	rhsLines := strings.Split(rhsToc, "\n")
+	for i, lhsLine := range lhsLines {
+		rhsLine := rhsLines[i]
+		lhsLine = strings.TrimSpace(lhsLine)
+		rhsLine = strings.TrimSpace(rhsLine)
+		// We don't care about ## lines
+		if strings.HasPrefix(lhsLine, "#") && strings.HasPrefix(rhsLine, "#") {
+			continue
+		}
+		// Nor do we care about empty lines
+		if lhsLine == "" && rhsLine == "" {
+			continue
+		}
+
+		log.Printf("%s %s", lhsLine, rhsLine)
+		if i >= len(rhsLines) || rhsLine != lhsLine {
+			return true
+		}
+	}
+	return false
+}
+func UpdateFile(localPath string, data []byte) (err error) {
+	err = os.MkdirAll(filepath.Dir(localPath), 0755)
+	if err != nil {
+		return fmt.Errorf("error creating directory: %w", err)
+	}
+	fileHandle, err := os.OpenFile(localPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
+	if err != nil {
+		return fmt.Errorf("error opening file: %w", err)
+	}
+	defer fileHandle.Close()
+	_, err = fileHandle.Write(data)
+	if err != nil {
+		return fmt.Errorf("error writing file: %w", err)
+	}
+
+	return nil
+}
+func (a *Addon) Update(body []byte) (err error) {
+	log.Printf("Updating %s", a.Name)
+	zipReader, err := zip.NewReader(bytes.NewReader(body), int64(len(body)))
+	if err != nil {
+		return fmt.Errorf("error creating zip reader: %w", err)
+	}
+	log.Printf("Found %d files", len(zipReader.File))
+	hasBreakingChanges := false
+	for _, file := range zipReader.File {
+		if file.FileInfo().IsDir() {
+			continue
+		}
+		log.Printf("Found file %s", file.Name)
+		fileHandle, err := file.Open()
+		if err != nil {
+			return fmt.Errorf("error opening file: %w", err)
+		}
+		fileData, err := io.ReadAll(fileHandle)
+		if err != nil {
+			return fmt.Errorf("error reading file: %w", err)
+		}
+
+		if strings.HasSuffix(file.Name, ".toc") {
+			localToc, err := os.ReadFile(a.GetLocalTocPath())
+			if err != nil {
+				if os.IsNotExist(err) {
+					localToc = []byte{}
+				} else {
+					return fmt.Errorf("error reading local toc: %w", err)
+				}
+			}
+			if a.HasBreakingChanges(string(localToc), string(fileData)) {
+				log.Printf("Has breaking changes")
+				hasBreakingChanges = true
+			}
+		}
+
+		localPath := filepath.Join(gamePath, "Interface", "AddOns", file.Name)
+		log.Printf("Updating file %s", localPath)
+		err = UpdateFile(localPath, fileData)
+		if err != nil {
+			return fmt.Errorf("error updating file: %w", err)
+		}
+	}
+	if hasBreakingChanges {
+		Warning.Printf("Has breaking changes")
+	}
+	return nil
+}
 func (a *Addon) GetLocalTocPath() string {
 	return filepath.Join(gamePath, "Interface", "AddOns", a.Name, a.Name+".toc")
 }
@@ -115,20 +207,25 @@ func (a *Addon) IsUpToDate() bool {
 
 func main() {
 	gamePath = filepath.Join("C:\\", "Games", "WoWRuski")
-	for _, addon := range addons {
-		log.Printf("%#v", addon.IsUpToDate())
-		log.Printf("%#v", addon.GetRemoteReleaseURL())
-		body, err := addon.GetRemoteRelease()
-		if err != nil {
-			log.Printf("error getting remote release: %s", err)
-			continue
-		}
-		log.Printf("%#v", string(body))
+	//	for _, addon := range addons {
+	//		log.Printf("%#v", addon.IsUpToDate())
+	//		log.Printf("%#v", addon.GetRemoteReleaseURL())
+	//	}
+	file, err := os.ReadFile("Heimdall.zip")
+	if err != nil {
+		log.Printf("error reading file: %s", err)
+		return
 	}
+	err = addons[0].Update(file)
+	if err != nil {
+		log.Printf("error updating addon: %s", err)
+		return
+	}
+	log.Printf("Addon updated")
 	return
 	app := NewApp()
 
-	err := wails.Run(&options.App{
+	err = wails.Run(&options.App{
 		Title:  "wails-template",
 		Width:  1024,
 		Height: 768,