you can import data from a SQL Server database into a Mendix application using the Mendix Data Importer module. Here's how: Install the Mendix Data Importer module, Configure the database connection, Define the mapping, Define the import settings, Run the import.
It's important to note that the Data Importer module can import data from a wide range of data sources, not just SQL Server databases. However, the process for importing data from different sources may vary slightly
According to the error prompt "Please make sure the userlib folder ...", I think you should double check if there is appropriate jar in that folder. The key point is the version of everything.
Mendix version, DatabaseConnector version, jdbc driver version, SQL server version.
My used relevant version for your reference.
Mendix V9.12.5
DatabaseConnector V5.0.6
jdbc driver mssql-jdbc-12.2.0.jre11.jar
sql server 2022 developer