For a home user with an old 32-bit PC, the Free tier is more than sufficient. You can leave the old laptop plugged into the router via Ethernet to act as a dedicated 24/7 network monitor.
If you absolutely cannot get the Fing 32-bit download to work, there are two lightweight alternatives that still support x86 Windows: download fing desktop 32 bit
Fing Desktop is a free, open-source network scanning and management tool that allows users to discover and monitor all devices connected to their network. Developed by Fing Ltd., Fing Desktop is available for Windows, macOS, and Linux platforms. The tool uses advanced algorithms to scan and detect devices on your network, providing you with detailed information about each device, including its IP address, MAC address, device type, and more. For a home user with an old 32-bit