The Freespace Community has always found the original Silent Threat lackluster and lacking in polish compared to the other two (official) Freespace Campaign.
...so once the Freespace MOD-ing and FRED-ing scene started up it was almost "inevitable" that a project was formed to "fix it"...
...several years later:
Silent Threat: Reborn Release
http://img525.imageshack.us/img525/4494/lokihugefp7.jpg
http://www.freeimagehosting.net/uploads/2648345ce1.jpg
http://www.hard-light.net/forums/index.php?topic=59120.0
After six years, numerous rewrites, substantial feature creep, and a few premature reports of project death, the FSPort Team is proud to finally bring you Silent Threat: Reborn. Big grin Containing eighteen missions, 947 voiced lines, dozens of SCP enhancements (while retaining retail compatibility), and countless hours of work, the final result is something we're very proud of. We hope you are as excited to play it as we are to release it.
Downloads
You may download Silent Threat: Reborn automatically using Turey's Installer or manually via the links below. Silent Threat: Reborn requires a full copy of FreeSpace 2 as well as the FreeSpace Port version 3.1 or later. Instructions for installing the Port can be found here:
http://www.hard-light.net/forums/index.php/topic,58357.0.html
ST:R Core (13.0 mb) [url=http://sectorgame.com/f2s/downloads.php?action=downloads&id=504]Sectorgame
ST:R Voice Pack (295.8 mb) [url=http://sectorgame.com/f2s/downloads.php?action=downloads&id=505]Sectorgame
The voice pack is HIGHLY RECOMMENDED. Several missions virtually require it. And it also delayed the release by about two years, so we think it's well worth waiting for.
Note that the default mod.ini does not use the mediaVPs. If you want to play with them (also highly recommended), then follow Vasudan Admiral's instructions below. Please note that if you want to use the FSPort mediavps, you must have the 3.6.10 mediavps installed as well, and you must use version 3.6.10 of FSO.
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Vasudan Admiral's Guide to Installing ST:R with MediaVPs
1) - Either run the FSO Installer or download the component files manually:
3.1.1 Port files - http://www.hard-light.net/forums/index.php/topic,58357.0.html
3.6.10 Media VPs - http://www.hard-light.net/forums/index.php/topic,58230.0.html
You need to end up with the following four folders in your \freespace2\ directory:
-> "mediavps" - Should contain MV_Complete.vp OR the individual MV_*.vp files. See the 3.6.10 thread for details.
-> "fsport" - Should contain fsport3_1_1.vp, fs1oggcutscenes.vp, fsport-hi_res.vp, fsport-missions.vp, sparky_hi_fs1.vp, stu_fs1.vp, tango_fs1.vp and warble_fs1.vp.
NOTE: Make sure sparky_hi_fs1.vp (as well as fsport3_1_1.vp) are the 3.1.1 versions, not the 3.0.4 versions.
-> "fsport-str" - Should contain fsport-str.vp, fsport-str-voice.vp, fsport-str.bmp and mod.ini
-> "fsport-mediavps" - Should contain mv_fsport.vp.
2) - Open mod.ini in your "\freespace2\fsport-str" folder and replace everything from the "[multimod]" part with this:
[multimod]
primarylist = fsport-mediavps;
secondarylist = fsport,mediavps;
3) - Open the freespace launcher and go to the mod tab. Select the 'fsport-str' folder as your active mod.
4) - Run the game and select the Silent Threat: Reborn campaign from the campaign room.

thank you, this is really helpful