Please follow these steps to download, install and activateMicrosoft SQL Server 2019 Standard successfully on your computer:
1. Go to Microsoft's website:
microsoft.com/en-us/evalcenter/evaluate-sql-server-2019 
2. Choose "SQL Server 2019" and download the ISO file
3. Copy the required files to a DVD or an USB flash drive, perform a clean installation and run SQL Server 2019 Standard
4. Activate the software using the product key provided by us
5. Enjoy Microsoft SQL Server 2019 Standard