I would recommend following the upgrade guide that's available in the documentation:
Hi,
You can safely upgrade your app from 9.24.24 to 10.x, even with modules like SAML 2.0 and Email Template, just follow these steps:
Take a full backup of your project and database.
Read the Mendix 10 release notes — check for breaking changes.
Open the project in Mendix 10 (preferably an LTS version like 10.6 or 10.12).
Update all Marketplace modules to their latest versions (SAML, Email Template, Community Commons, etc.).
Fix any migration warnings shown after opening.
Test key features like SSO and email sending thoroughly.
If using native mobile, rebuild the native app after upgrade.
That’s it — this process works smoothly in most cases. Just make sure to test everything in your test environment before moving to production.
Regards
Reemali