The oldanim.tmodel.zip file you have requested: Skins / Players / CS: Source Old Terrorist Model - 1.37mb is not available. Perhaps try browsing all files for the game Counter-Strike: Source and upload any files you want to share or are missing. This is the only information we could locate:
This is the terrorist model prior to the July 6th Terrorist Model update. By using the older Terrorist model, and animations, you can use the older custom skins/models that were made for it. There is a glitch however, that makes it so the bomb is underneath the Terrorist's feet, instead of on their back, as seen in the picture below.