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Ability to unlock this starting scenario was removed in a patch. There are however hacks to force it to become unlocked. To unlock this starting scenario Use an XML editor to open the 03.cat file of the game (usually under Steam\SteamApps\Common\X3 Terran Conflict\Addon) and extract the gamestarts.pck file. Open the gamestarts.xml file and go down until "<!-- Yaki Insurgent Weaver's Tempest Removed for X3TC 1.0", add "-->" after Tempest and delete "Removed for X3TC 1.0". Finally six lines down delete the "-->" from "gamestart>-->" and save. Create the files L\true under the game directory (file?) and copy the .xml to it. in In theory a similar tactic could be used to unlock the old game starts from X3: Reunion but most of those lack access to the plots and all lack data for ship creation.
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