do not show download locally action in web

src/vs/workbench/contrib/extensions/browser/extensionsActions.ts

@@ -58,7 +58,7 @@ import { IContextMenuProvider } from 'vs/base/browser/contextmenu';
 import { ILogService } from 'vs/platform/log/common/log';
 import * as Constants from 'vs/workbench/contrib/logs/common/logConstants';
 import { infoIcon, manageExtensionIcon, syncEnabledIcon, syncIgnoredIcon, trustIcon, warningIcon } from 'vs/workbench/contrib/extensions/browser/extensionsIcons';
-import { isWeb } from 'vs/base/common/platform';
+import { isIOS, isWeb } from 'vs/base/common/platform';
 import { IExtensionManifestPropertiesService } from 'vs/workbench/services/extensions/common/extensionManifestPropertiesService';
 import { IWorkspaceTrustManagementService } from 'vs/platform/workspace/common/workspaceTrust';
 import { isVirtualWorkspace } from 'vs/platform/remote/common/remoteHosts';
@@ -110,6 +110,7 @@ export class PromptExtensionInstallFailureAction extends Action {
 		@IDialogService private readonly dialogService: IDialogService,
 		@ICommandService private readonly commandService: ICommandService,
 		@ILogService private readonly logService: ILogService,
+		@IExtensionManagementServerService private readonly extensionManagementServerService: IExtensionManagementServerService,
 	) {
 		super('extension.promptExtensionInstallFailure');
 	}
@@ -136,9 +137,8 @@ export class PromptExtensionInstallFailureAction extends Action {
 			return;
 		}
 
-
 		const promptChoices: IPromptChoice[] = [];
-		if (this.extension.gallery && this.productService.extensionsGallery) {
+		if (this.extension.gallery && this.productService.extensionsGallery && (this.extensionManagementServerService.localExtensionManagementServer || this.extensionManagementServerService.remoteExtensionManagementServer) && !isIOS) {
 			promptChoices.push({
 				label: localize('download', "Try Downloading Manually..."),
 				run: () => this.openerService.open(URI.parse(`${this.productService.extensionsGallery!.serviceUrl}/publishers/${this.extension.publisher}/vsextensions/${this.extension.name}/${this.version}/vspackage`)).then(() => {