🐛 don't use extension.uuid for download path

fixes #25738

src/vs/platform/extensionManagement/node/extensionGalleryService.ts

@@ -7,6 +7,7 @@ import { localize } from 'vs/nls';
 import { tmpdir } from 'os';
 import * as path from 'path';
 import { TPromise } from 'vs/base/common/winjs.base';
+import * as uuid from 'vs/base/common/uuid';
 import { distinct } from 'vs/base/common/arrays';
 import { getErrorMessage } from 'vs/base/common/errors';
 import { ArraySet } from 'vs/base/common/set';
@@ -369,7 +370,7 @@ export class ExtensionGalleryService implements IExtensionGalleryService {
 
 	download(extension: IGalleryExtension): TPromise<string> {
 		return this.loadCompatibleVersion(extension).then(extension => {
-			const zipPath = path.join(tmpdir(), extension.uuid);
+			const zipPath = path.join(tmpdir(), uuid.generateUuid());
 			const data = getGalleryExtensionTelemetryData(extension);
 			const startTime = new Date().getTime();
 			const log = duration => this.telemetryService.publicLog('galleryService:downloadVSIX', assign(data, { duration }));