ML.NET Model Builder 2019, upgrade from 16.15 to 16.16

System Information:
- Model Builder Version 16.15
- Visual Studio Version 2019

When I try to install ML.NET Model Builder 2019 (version 16.16) it appears to be version 16.15. I downloaded this extension from [Marketplace](https://marketplace.visualstudio.com/items?itemName=MLNET.07). The page says its version should be 16.16. But in reality its version is 16.15, see extension manifest:

To Reproduce:
1. Go to Extension manager in Visual Studio 2019 and try to upgrade Model Builder from version 16.15 to 16.16. After VS is closed and upgrade is started, it says that Model Builder is already installed.
2. Go to Extension manager in Visual Studio 2019 and try to upgrade Model Builder from Preview to 16.16. As a result, version 16.15 is installed.

Expected behavior:
I expect Model Builder 16.16 to be installed in VS 2019.

Iniziare dal manifest dell’estensione mostrato nel report e confrontarlo con il pacchetto pubblicizzato nel Marketplace come versione 16.16. Riprodurre entrambi i percorsi di aggiornamento in Visual Studio 2019. Il lavoro è completato quando il pacchetto 16.16 pubblicato presenta metadati della versione corrispondenti e viene installato come 16.16 invece di riportare 16.15.

Scritto dal modello di indicizzazione a partire dal testo della issue.