Step 1

When downloading, make sure that you select the right language. It must match the language set on the server (where the database is later installed):

Step 2

Then select the SQL version with tools according to the server operation system:

Important:

The Express version is limited to a database file size of 10 GB and also offers only limited performance (according to Microsoft’s terms of use). 10 GB suffice typically for 200 million measured values.