If you are looking for the most modern version today, you should download or SSMS 20 from the Official Microsoft Download Page. Understanding SSMS Versioning

Released in 2024, this version introduces mandatory connection encryption and is built for modern security standards.

If you meant a different tool (e.g., Azure Data Studio, Visual Studio 2020 with SQL tools), let me know and I can refine the answer.

Заметки о выпуске SQL Server Management Studio (SSMS) 20