It not only updates appx. You must run it with administrator privileges. If it doesn't work, please restart your PC.
On a latest installation of Windows 11 23H2, the "Windows Security Platform update" (1.0.2401.13001) three days now and it's not installed. Only the latest "Anti Malware Platform Update" 4.18.23110.3. Is it still needed or not?
I know about the "run as admin" and i have the file ready for offline installation. I'm only curious to why it's not installed from WU. I just checked again for WU updates and from Defender within but again it didn't came up. MS magic.
ms dont do regular updates for securityui because they cant be removed only the platform updates get cleaned, i think the person posting the updates to platform are in a preview or beta program for defender wu only updates when theres a security flaw or bug theyve found I cleaned out the secuirty health folder and left the latest one installed which resulted in wu trying to install a lower version package over and over, i was testing the outcome