Released: October 2021 Exchange Server Security Updates

I've installed on my Exchange 2013 CU23 this latest security update. our schema master is in an empty root domain. as per the instructions, i created a Windows 2012 R2 server in our root domain, installed just the Exchange 2013 CU23 Management tools on it, installed this latest security update aswell, but when i run from elevated command prompt to update Schema: Setup.exe /PrepareSchema /IAcceptExchangeServerLicenseTerms , i receive the below error:

C:\Program Files\Microsoft\Exchange Server\V15\Bin>Setup.exe /PrepareSchema /IAcceptExchangeServerLicenseTerms

Microsoft Exchange Server 2013 Cumulative Update 23 Unattended Setup

The Exchange Server setup operation didn't complete. More details can be found
in ExchangeSetup.log located in the <SystemDrive>:\ExchangeSetupLogs folder.

in the Exchange setup logs, i see this:

Operating system version: Microsoft Windows NT 6.2.9200.0.
[0] Setup version: 15.0.1497.24.
Logged on user: (removed user).
Command Line Parameter Name='prepareschema', Value=''.
Command Line Parameter Name='iacceptexchangeserverlicenseterms', Value=''.
Command Line Parameter Name='sourcedir', Value='C:\Program Files\Microsoft\Exchange Server\V15\Bin'.
RuntimeAssembly was started with the following command: '/PrepareSchema /IAcceptExchangeServerLicenseTerms /sourcedir:C:\Program Files\Microsoft\Exchange Server\V15\Bin'.
[0] The registry key, HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange\v8.0, wasn't found.
[0] The registry key, HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ExchangeServer\v14, wasn't found.
[0] Assembly dll file location is C:\Program Files\Microsoft\Exchange Server\V15\bin\Microsoft.Exchange.Setup.Console.dll
[0] [ERROR] Exception has been thrown by the target of an invocation.
[0] [ERROR] Could not load file or assembly 'Microsoft.Exchange.CabUtility.dll' or one of its dependencies. The specified module could not be found.
[0] CurrentResult SetupLauncherHelper.loadassembly:444: 1
[0] The Exchange Server setup operation didn't complete. More details can be found in ExchangeSetup.log located in the <SystemDrive>:\ExchangeSetupLogs folder.
[0] CurrentResult main.run:235: 1
[0] CurrentResult setupbase.maincore:396: 1
[0] End of Setup

I installed the management tools on this server using elevated command prompt and running this: Setup.exe /Role:ManagementTools /InstallWindowsComponents /IAcceptExchangeServerLicenseTerms pointing to the setup files for Exchange2013 CU23. rebooted server after aswell

Let me know how this can be resolved and i can update the Schema

Thank you