feat(nsis): add option to disable differential download

.changeset/violet-icons-approve.md

@@ -0,0 +1,5 @@
+---
+"electron-updater": patch
+---
+
+feat(nsis): add option to disable differential download

docs/api/electron-builder.md

@@ -1788,6 +1788,9 @@ return path.join(target.outDir, <code>__${target.name}-${getArtifactArchName(arc
 <p>Currently false to prevent breaking the current API, but it should be changed to default true at some point that breaking changes are allowed.</p>
 </li>
 <li>
+<p><code id="AppUpdater-disableDifferentialDownload">disableDifferentialDownload</code> = <code>false</code> Boolean - <em>NSIS only</em> Disable differential downloads and always perform full download of installer.</p>
+</li>
+<li>
 <p><code id="AppUpdater-forceDevUpdateConfig">forceDevUpdateConfig</code> = <code>false</code> Boolean - Allows developer to force the updater to work in “dev” mode, looking for “dev-app-update.yml” instead of “app-update.yml” Dev: <code>path.join(this.app.getAppPath(), &quot;dev-app-update.yml&quot;)</code> Prod: <code>path.join(process.resourcesPath!, &quot;app-update.yml&quot;)</code></p>
 </li>
 <li>

packages/electron-updater/src/AppUpdater.ts

@@ -91,6 +91,13 @@ export abstract class AppUpdater extends (EventEmitter as new () => TypedEmitter
    */
   disableWebInstaller = false
 
+  /**
+   * *NSIS only* Disable differential downloads and always perform full download of installer.
+   *
+   * @default false
+   */
+  disableDifferentialDownload = false
+
   /**
    * Allows developer to force the updater to work in "dev" mode, looking for "dev-app-update.yml" instead of "app-update.yml"
    * Dev: `path.join(this.app.getAppPath(), "dev-app-update.yml")`
@@ -493,6 +500,7 @@ export abstract class AppUpdater extends (EventEmitter as new () => TypedEmitter
         requestHeaders: this.computeRequestHeaders(updateInfoAndProvider.provider),
         cancellationToken,
         disableWebInstaller: this.disableWebInstaller,
+        disableDifferentialDownload: this.disableDifferentialDownload,
       }).catch((e: any) => {
         throw errorHandler(e)
       })
@@ -696,6 +704,7 @@ export interface DownloadUpdateOptions {
   readonly requestHeaders: OutgoingHttpHeaders
   readonly cancellationToken: CancellationToken
   readonly disableWebInstaller?: boolean
+  readonly disableDifferentialDownload?: boolean
 }
 
 function hasPrereleaseComponents(version: SemVer) {

packages/electron-updater/src/NsisUpdater.ts

@@ -64,7 +64,11 @@ export class NsisUpdater extends BaseUpdater {
             "disableWebInstaller is set to false, you should set it to true if you do not plan on using a web installer. This will default to true in a future version."
           )
         }
-        if (isWebInstaller || (await this.differentialDownloadInstaller(fileInfo, downloadUpdateOptions, destinationFile, provider))) {
+        if (
+          isWebInstaller ||
+          downloadUpdateOptions.disableDifferentialDownload ||
+          (await this.differentialDownloadInstaller(fileInfo, downloadUpdateOptions, destinationFile, provider))
+        ) {
           await this.httpExecutor.download(fileInfo.url, destinationFile, downloadOptions)
         }