Best place to look is CyCorp zone 4 (forgot the name) just before the second Vular egg nest. There are two locations in the hallway preceding that nest where the Vular Ticker may randomly spawn. These two locations are marked by enemy HP bars which can occasionally be seen floating in mid-air. If you get to the second nest and have not run into the Ticker, remake the same level and repeat until you do. Also, I recommend locking your runs (always) and sending invites if/when you run into Ticker. Before you kill it, of course!