Fix the overwrite installation issue by different version

packages/electron-updater/src/MacUpdater.ts

@@ -1,6 +1,7 @@
 import { AllPublishOptions, newError, safeStringifyJson, CURRENT_MAC_APP_ZIP_FILE_NAME } from "builder-util-runtime"
 import { stat } from "fs-extra"
-import { createReadStream, copyFileSync } from "fs"
+import { createReadStream, copyFileSync, readFileSync, writeFileSync } from "fs"
+import { join } from "path"
 import { createServer, IncomingMessage, Server, ServerResponse } from "http"
 import { AppAdapter } from "./AppAdapter"
 import { AppUpdater, DownloadUpdateOptions } from "./AppUpdater"
@@ -86,10 +87,19 @@ export class MacUpdater extends AppUpdater {
       fileInfo: zipFileInfo,
       downloadUpdateOptions,
       task: async (destinationFile, downloadOptions) => {
-        if (await this.differentialDownloadInstaller(zipFileInfo, downloadUpdateOptions, destinationFile, provider, CURRENT_MAC_APP_ZIP_FILE_NAME)) {
+        const currentVersionFileName = "currentVersion"
+        const currentVersion = readFileSync(currentVersionFileName, "utf8")
+        let differentialDownloadedFailed = false
+        if (currentVersion === this.app.version) {
+          differentialDownloadedFailed = await this.differentialDownloadInstaller(zipFileInfo, downloadUpdateOptions, destinationFile, provider, CURRENT_MAC_APP_ZIP_FILE_NAME)
+        }
+
+        if (differentialDownloadedFailed) {
           await this.httpExecutor.download(zipFileInfo.url, destinationFile, downloadOptions)
         }
-        copyFileSync(destinationFile, this.downloadedUpdateHelper!.cacheDir + "/update.zip")
+
+        copyFileSync(destinationFile, join(this.downloadedUpdateHelper!.cacheDir, CURRENT_MAC_APP_ZIP_FILE_NAME))
+        writeFileSync(currentVersionFileName, downloadUpdateOptions.updateInfoAndProvider.info.version)
       },
       done: event => this.updateDownloaded(zipFileInfo, event),
     })