Given the constraints, I can offer some guidance on how to find this document:
: Multiple users have uploaded the full 764-page text (covering the 17th and other editions). You can view it online or download it with a subscription at Scribd - Arturo Valencia Zea PDF .
: Academic copies used by university students (e.g., Universidad Externado de Colombia) are available for download at StuDocu - Derecho Civil .