Hi Klaus, upgrading Odoo Community from V18 to V19 directly is possible, but it requires careful planning and execution.

  Backup Your Database: Before starting, create a full backup of your Odoo V18 database. This ensures you can revert if anything goes wrong.

  Upgrade Odoo: Download the Odoo V19 installation package for Windows from the Odoo website and install it. During installation, point it to use your existing database.

  Update Apps: After installation, open Odoo V19. Odoo will prompt you to update your installed apps. Follow the on-screen instructions to update them. This step is crucial as it adapts the modules to the new version.

  Address Deprecated Code: Custom modules might contain deprecated code that needs updating. Check the Odoo documentation for V19 to identify and update any deprecated code in your custom modules.

  Test Thoroughly: After the upgrade, thoroughly test all critical business processes to ensure everything works as expected. Pay special attention to custom modules and reports.

For personalized assistance:
https://www.pragtech.co.in/contact-us-mql.html

Hi,

Upgrading directly from Odoo Community v18 to v19 without starting fresh isn’t possible because Odoo doesn’t provide an in-place upgrade path for Community editions. Database structures change significantly between major versions, so simply pointing Odoo 19 to your v18 database would break the system.

If you want a seamless upgrade, the only official option is to switch to Enterprise, where Odoo’s upgrade service will migrate your database for you. For Community users, the most common approach is using OpenUpgrade, a community project that provides migration scripts to transform your v18 database into v19 format. However, this requires some technical setup and may need manual fixes for custom modules.

Another alternative is to do a clean install of Odoo 19 and manually export/import your important data such as customers, products, and invoices. This approach is simpler but you risk losing configuration and history unless carefully managed.

On Windows, migrations are harder since OpenUpgrade and Odoo are better supported on Linux. In practice, you may need a Linux VM, Docker, or WSL to run the migration, even if your production environment stays on Windows.

Hope it helps