How Do I Use Virtual Instruments As Plugins In PT 7.4 LE

I just bought the eastwest Goliath product and after installing went into pro tools le 7.4 to try it out. I went to: new track>stereo>audio track>samples then went to the mixer>insert>multichannel plugin but i cannot find goliath, eastwest, or anything closely related to pull from. Can someone tell me what I am missing here? Understand I am not technical and not an expert at pro tools so kinda walk me through. Thanks!

Is this with the Play or Kompact or Structure player?

This is with the recent Goliath PLAY.

It's been resolved. I thought I had UAC clicked off when I installed the new update version. Once I turned off then did the update the RTAS component was installed and everything worked. I do have a side question on this though... How do I use these new virtual instruments on already prerecorded tracks? I have several songs that I want to update strings, drums, etc but when I inserted VI in the mixer on that track nothing happens. The instrument doesnt play no sound on that track, etc. Any suggestions? Thanks

Pre-recorded MIDI tracks? You'll probably have to change the MIDI output to your new plug-in. It is right at the top of the instrument track. If you can't see it, you'll have to show it: Views>Mix Window Views>Instruments If you're using a MIDI track the ouput selector is in the central I/O section.