How do I detect the installation of SQL server, direct X, VC 2022 and dotnet 6.0 using inno setup script

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Pascal

InnoSetup

I need to create an installer which checks for the installation of SQL Server 2019 Express Edition, Direct X, VC 2022 and Dotnet FX.

With help from this link I was able to include the download pages in the setup.

My problem is how to check if the installations exist on the client's machine and skip the download if it truly does.

PS: I am very new to Inno Setup

What I have tried:

function InitializeSetup: Boolean;
begin
  // add the dependencies you need 
	Dependency_AddDotNet60Desktop;
	
  Dependency_AddVC2015To2022;
	
	Dependency_AddSql2019Express;
	
  Dependency_AddDirectX;
  // ...

  Result := True;
end;