If you must use an RV042, you must mitigate the lack of firmware support:

For the hardcore networking enthusiast, the RV042 offers a path to resurrection.

Cisco RV042 Dual WAN VPN Router Go to product viewer dialog for this item.

The Cisco RV042 Dual WAN VPN Router firmware is critical for maintaining the device's stability, security, and performance. Because this router has been released in several hardware iterations over many years, the most important rule is to match your firmware version to your specific hardware version to avoid "bricking" the device. Cisco Community +1 Critical Hardware and Version Matching Before downloading any files, you must identify your router's hardware version: Hardware V1/V2

The primary reason the RV042 remains relevant is its Dual WAN capability. The firmware is specifically coded to manage two internet connections. This functionality is more complex than simple load balancing.

In recent years, researchers discovered a critical authentication bypass vulnerability (specifically affecting the web management interface). Because the firmware is no longer updated, a stock RV042 on the public internet is a significant security risk.