I believe there's an option to verify the presence of the game while installing the expansions (since they require it), but outside of that, there's no option to do that. Ideally, if your old machine is still functional, you'd use the archival options rather than just copying the files over, so that you get a "proper" installation. In Impulse's case that would require a download (the option to archive already installed programs is currently disabled for an overhaul), but SDC should be able to do it just fine, and also has the latest version of DL.