Download SQL Server Management Studio (SSMS) - SQL Server Management Studio (SSMS) | Microsoft Learn
SSMS 19.0.1 is the latest general availability (GA) version. If you have a preview version of SSMS 19 installed, you should uninstall it before installing SSMS 19.0.1. If you have SSMS 19.0 installed, installing SSMS 19.0.1 upgrades it to 19.0.1.
SQL Sentry Plan Explorer does not support SSMS 19.x