How I can acess office 2016 professional plus installation file
End of support for Office 2016 and Office 2019 | Microsoft Support
However, without direct reference from Microsoft, the exact breakdown can be speculative. This build or version number suggests it might be a specific update or patch level for Office 2016 Pro Plus, possibly including security updates, feature updates, or fixes.
: You still require a valid 25-character product key to use the software beyond the trial period.