it says waiting for another update and nothing happens.
Again fetching patch manifest forever like days ago. Blizzard is slow.
There currently are slow downloading speeds Breaking News - Blizzard Support
I’ve heard that pausing and restarting the download should fix the issue.
If not i recommend issuing a Scan & Repair which can be found under the “Options” tab in the Battle.net launcher.
If that does not work please refer to this article: Troubleshooting Installation and Patching - Blizzard Support