You can find the new vehicles at the vehicle dealer after you've downloaded the expansion.
However, you won't be able to use the new vehicles or start the new jobs yourself. Features:
New vehicle: LIEBHERR A 918 wheeled excavator
New vehicle: LIEBHERR L1 fast-erecting crane
New vehicle: LIEBHERR R 956 crawler excavator
Three new construction contracts
Alongside the eagerly awaited LIEBHERR A 918 wheeled excavator, the eighth official Construction Simulator 2015 expansion also offers the LIEBHERR L1 fast-erecting crane and the LIEBHERR R 956 crawler excavator to expand your motor pool.The LIEBHERR A 918 expansion can be played alone in single-player mode, or in multiplayer with up to four players.