As already explained many times in this thread, the Lumia 1320 is not supported for the update to Windows 10 Mobile due to the feedback from the Insider program testing. It will never be supported for W10M, it will never receive the update. All development
for W10M ended November 2017, so definitely no one will be working on making W10M available for unsupported phones like the 1320. There is absolutely no point in posting any further requests here, nobody is listening. Support for WP8.1 ended in July 2017,
development for W10M ended in November 2017. Windows mobile is effectively dead, it is time to move on.