'Performed an update to SP3 for SQL Server 2016 and now my Server won't start

I executed the SP3 update and afterwards my SQL Server won't start.

Logs say that the master file is corrupted. I have backups of all the databases in the server but I cannot restore them as the server is offline.

I've searched around and saw some suggestions to re-run the setup file but I am having trouble locating an SQL Server 2016 installer.

I'm currently trying to restore the master database in another server instance but that is producing it's own issues.

Is there a way to fix this issue with as little data loss as possible? There is production data in the servers as well so I do not want to lose anything



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