If "The Old Hunters" text doesn't appear on the title screen, you must force enable it:
Using the repack of v1.09 ensures you have all the Old Hunters DLC assets already merged correctly. Trying to mod v1.00 or v1.04 is a nightmare of missing map files; v1.09 just works . bloodborne v109 dlc mods cusa00900 repack work
(Gameplay)
Since the base game is locked at 30 FPS with frame pacing issues, mods are highly recommended for the best experience on PC: If "The Old Hunters" text doesn't appear on