The following steps must be performed as part of the migration process:
Step 1: Create the delivered SDB 12.1 database using SDBSetupWizard.exe.
Step 2: Run the pre migration scripts on the SDB 2018 R1 / SDB 2020 database which needs to be migrated to SDB 12.1.
Step 3: Do the Merge & Save of data from source database to target database to complete the migration/upgrade process.