Getting in Top Shape Again

M3: Getting in Top Shape Again is a main mission in Deus Ex: Mankind Divided.

Find Koller inside the bookstore
Jensen has to make it inside The Time Machine to talk to Koller. The bookshop is being raided by Dvali henchmen and so it is difficult to access it through the main gate, unless you knock out or kill the man guarding it. Instead, you can turn to the left of the main gate towards a police checkpoint. Talking to the documents inspector triggers the side mission The Golden Ticket which can either be completed now, or avoided by sneaking past the checkpoint. There is a route to the right that you can use to avoid being seen, covered by a box.

Once on the other side, there is a second floor apartment right above the checkpoint with a vent in it. This vent leads to rooftops directly opposite the bookstore. You will need to do some climbing to reach the apartment. However, going this way allows you to avoid confrontation. Either deal with the Dvali patrolling outside the building, or sneak past them and into The Time Machine a number of ways. One is through the front door, which you are likely to be spotted doing. Another is through one of the bottom floor windows, which also might be risky unless you have taken care of the guards. There is a back entrance into the store to the right of the main door. The door to this back room can be hacked, or just enter the code 1984 to open it. Alternatively, there are windows on the roof you can drop down from.

Once inside, make your way up to the second floor. Koller's office is on this floor, but when you reach it, it will be empty. Koller contacts you by infolink at this point and tells you to meet him in his "dungeon".