The full Invader (i.e. the Observers who hatched the invasion plan) plan was first to send 12 Observers back in time, these 12 then (unknowingly) scout history to find suitable times to invade. These 12 were told they were just studying history, and were the Observers we saw all over the place in the first 4 seasons.
With the scouting complete, the Invaders then analyzed history and found likely targets for when to invade. They have the capability to predict futures, so they applied this ability to determine the best time to invade. They found this perfect time to invade in 2015, and so they launched their attack.
This is revealed in episode S05E11, The Boy Must Live, when Windmark requests authorization to travel back in time in the present to catch the Fringe time at a time and place he knows they were. He's not allowed, as they have rules about time traveling during the time of the invasion, as they fear doing so would disrupt their 99.9999% chance of succeeding in the invasion.
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