I don't know what pack you bought, so I don't know the answer to that. If it's a VI plug-in, then I'd think you should be able to use it in a DAW or other plug-in host. But if it's a Voice & Style Expansion for a given Yamaha keyboard, or expansion module for a given soft synth, or something like that, then you probably can't use it without having the hardware or software synth that it's designed for.