Eleventa uses Firebird SQL. The 2021 installer usually bundles this, but you may select "Full Installation" to include the Firebird server.
If you own a legitimate license for Eleventa Full 2021, contact your provider immediately to discuss upgrade pricing to a CFDI 4.0 compliant version. If you are looking for a "full" solution today, consider Eleventa 2024/2025 or move to a cloud-based alternative that auto-updates with SAT laws. eleventa full 2021
Upon first launch, you must create or restore an empty database file ( .gdb ). Name it Facturas2021.gdb . Eleventa uses Firebird SQL
Navigate to Help > License . Load your license.key file. A "Full 2021" license will unlock all modules (Facturación, Nóminas, Recepción) without "Demo" watermarks. Recepción) without "Demo" watermarks.