Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello Nojus
I am V. Arya, Independent Advisor, to work with you on this issue. First you should remove your Office 2016 (if not present, then remove 2019 itself) completely using Uninstall Support Tool of Microsoft. This will remove all traces of previous Office installation from your computer. This will also wipe out Outlook related data. Hence, you may like to take Outlook data backup.
Uninstall Office using Option 2 - Completely uninstall Office with the uninstall support tool
https://support.office.com/en-us/article/uninst...
Reinstall Office 2019 - https://support.office.com/en-us/article/downlo...