Since the Official ManyCam Download Page only hosts the latest version (currently 9.x), you must use reputable third-party archives to find version 4.0.52:

Low System Impact: Designed for older hardware and operating systems like Windows 7, Vista, and XP.

ManyCam 4.0.52 is a significant legacy version of the popular virtual webcam software, originally released in February 2014. It is often sought after today for its lower system overhead compared to modern versions, making it a "solid" choice for users on older hardware or those who prefer its specific interface and features. The Role of ManyCam 4.0.52 in Digital Media

Download ManyCam 4.5.2 Old Version (Updated): The Ultimate Guide to Stability & Performance

Introduction

ManyCam has long been the industry standard for live video streaming, video conferencing, and screen sharing. However, with each new release, users often report resource-heavy performance, lag, or the removal of beloved features. This has led to a resurgence of interest in ManyCam 4.5.2 Old Version (Updated)—a classic build that balances functionality with low system demands.