title: How to piggyback an MSI installer within an MSI installer
body: <p>This is my first time attempting to use Windows Installer to build a setup package (our client does not wish to use Wix, which I have worked with extensively). Currently I have an MSI that builds and works as intended. However, I need to add an installer for an SDK that is required for the program I have written to work on other machines. I have added the second installer (also an MSI) as a Custom Action which executes based on whether you tick a checkbox during the installation process. The problem is, when the second installer executes, I get the error that there is already a setup being run on the system and the installation cannot continue. How can I get around this? The custom action is set to run during Install.</p>
  
  <p>Thanks in advance for any help in solving this problem.</p>