Mission Maker v 1.6 latest updated version. If you haven't updated the version from the updater yet, or you have problems - here it's a standalone version.
Changelog for v 1.6:
-Added walking styles for actors.
-Added the Tools menu.
-Added teleport to interiors.
-Added a test vehicle.
-Through the tools menu, the mission can be started from the selected objective/
-Added the issuance of a jetpack through the tools menu.
-Added camera shake.
-Added camera zoom.
-Time objective now have a timer.
-Added advanced traffic settings.
-Added a completely new editing of objects.
-Added more animations.
-Added deletion of objects after the objective.
-"Open component", "Close component" have been added to actions with cars.
-Added the objective "Enter Code" - What it does - is you can enter any code (that's not a cheat) and succesfully run it as a objective. For example you can type "Press B to trigger something" and attach "B" to the objective, so if player presses that key it will work - same thing with words: you'll type any word and apply it, if player does that in a mission it will also work - great for puzzle missions, or safe-cracking missions.
-Updated the mission script.
-Fixed voice acting and animations for the "jill" skin.
-Added disabling auto-updates.
-The update download system has been accelerated and improved.
Alternate link from LibertyCity
If after playing the mission that's in the archive, it will crash - don't worry, after playing mission just remove it and if it will crash just restart the game, it will work fine from now. Safely, you can delete mission files from miss folder and then restart game and you should be good.
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