The NAV SEAL Migration app is a free extension file (.app) that you download here and upload into your Business Central online environment; installing it takes about five minutes.
Download: NAV SEAL Migration app (link to be added)
Once it's installed, see the article Data Migration to Business Central with NAV SEAL Migration to start your first migration project.

You need Business Central online version 28 or later and permission to manage extensions.
The app is a per-tenant extension: it is installed in one environment at a time. Install it separately in each sandbox and production environment where you want to use it.
Download the latest version from this knowledge base and save the .app file somewhere you can find it.
NAV SEAL_NAVSEAL Migration_1.0.0.0.app.Always use the version from this knowledge base. It is the only version NAV SEAL supports.

You upload the file on the Extension Management page, and Business Central installs it in the background.
The installation runs in the background and usually finishes within a few minutes. You can keep working while it runs.

The app is ready when it shows as installed on Extension Management and your users have the permission set and the Data Migration profile.
Check the installation
Give users access
Users who switch to the Data Migration profile see a role center with migration projects, files and progress.

To update, download the new version from this knowledge base and upload it the same way; your migration projects and data are kept.
Avoid updating while migration jobs are running; let them finish first.
Update the sandbox first and check that your project still works before updating production.

When the migration is finished, you can uninstall the app; whether its data is kept depends on one setting.
The master data, journal lines and posted entries the app created in Business Central stay either way.
Keep the app installed if you migrated history. Sales, purchase, item and G/L history live in the app's own tables and are viewed through the app's pages. Uninstalling with Delete Extension Data turned on removes that history.

Most installation problems come from permissions, the Business Central version or a changed file.
Still stuck? Submit a ticket through this help center with a screenshot of the Deployment Status entry, or book a free Data Migration Assessment and we'll install it with you.