I think cleanmgr will delete some of the old platform updates from ProgramData folder, but it will leave the last two platform updates that were installed. It's under Microsoft Defender Antivirus files.
I will be releasing the updated defender cabs at 2am GMT this morning. Defender cabs are now available
Thank you @atplsx for posting the direct download links for all versions of the Beta platform updates, over the past few months. It's definitely appreciated.
... thanks, corrected... was in a rush and didnt spot the error, you would think that at my age that I still get caught out taking M$ info as gospel
Dont install dev security health setup on lesser builds, it messes up the update servers when it comes to Microsoft pushing the correct version for your build You can install the platform updates ..but you will have to manually check this thread and update yourself after