The max database size of 10 GB for the free Express Edition is fix, you can't change.
Purchase a standard edition.
Or take the effort (and disadvantages) to split you data over several databases, so call "data sharding".
I have created a system with C# and SQL Server Developer, the system runs on a local computer.
I need a storage between 20 to 50 gigabytes inside the SQL Server.
What do I have to do ?
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