To ensure you get the full, secure version with all the latest patches and cloud save support, you should use official digital storefronts:
The game wasn't just a download; it was a gateway. Within minutes, Jax was swinging through the air, firing a Pixelizer at Goons-4-Less, and realizing that the wait for the PC version had been worth every second. The dimension-hopping adventure wasn't just exclusive to a console anymore—it was alive on his rig, smoother and sharper than he’d ever imagined. PC system requirements download game ratchet and clank pc full version exclusive
You can download the full version through major digital storefronts. Avoid unofficial "exclusive" download sites, as these often contain pirated content or malware. To ensure you get the full, secure version