Fix bug with failed downloads not erroring out. (#6123)

Author: sean-mcmanus

Extension/src/packageManager.ts

@@ -220,7 +220,7 @@ export class PackageManager {
             } catch (error) {
                 retryCount += 1;
                 lastError = error;
-                if (retryCount > MAX_RETRIES) {
+                if (retryCount >= MAX_RETRIES) {
                     this.AppendChannel(" " + localize("failed.download.url", "Failed to download {0}", pkg.url));
                     throw error;
                 } else {