The engine requires only 2-3 MB of disk space.
Microsoft continues to provide the SQL Server Compact 3.5 Service Pack 2 (SP2) runtime and development tools through its official download center. microsoft sql server compact edition 3.5 download
Visual Studio 2008 SP1 (native support) or Visual Studio 2010 The engine requires only 2-3 MB of disk space
Microsoft SQL Server Compact Edition (SQLCE) 3.5 is a free, lightweight, in-process database engine designed for mobile and desktop applications. While modern development has largely shifted to SQLite or SQL Server Express, SQLCE 3.5 remains essential for maintaining legacy Windows Mobile 5/6 and early Windows 7-era applications. Official Download Options microsoft sql server compact edition 3.5 download
Offers 128-bit file-level encryption and password protection. Installation & System Requirements Requirement OS