Will this work with a computer that only has USB 2.0?

Yes it does. I tried (on a W7 and an a W10 box) that to see if it can work as a secondary port or as an emergency Ethernet port if the motherboard port fails. Obviously, it will run slower than 1Gb.

Which operating systems are compatible with the USB to RJ45 adapter?

The adapter is compatible with Windows versions 7 and up, Windows Server, macOS 10.14 and up, Linux distributions with kernel 4.11 and up (LTS only), and Chrome OS.

What speeds does the StarTech.com USB 3.0 to Gigabit Network Adapter support?

The adapter supports speeds of 10/100/1000 Mbps.

Questions & Answers: StarTech.com USB 3.0 to Gigabit Network Adapter - Silver - Sleek Aluminum Design Ideal for MacBook, Chromebook or Tablet

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StarTech.com USB 3.0 to Gigabit Network Adapter - Silver - Sleek Aluminum Design Ideal for MacBook, Chromebook or Tablet

USB NETWORK ADAPTER: USB to RJ45 adapter adds an Ethernet port to your computer supporting up to Gigabit speeds on 10/100/1000 Mbps Networks; Ideal for reliable wired gigabit network connections, or as an alternative to WiFi
FULL FEATURED: USB to Ethernet dongle; Uses Realtek RTL8153 Chipset for native compatibility with laptops and desktops, and 2-in-1's computers; USB Bus Powered; Status & Activity LED indicators
OS COMPATIBILITY: USB NIC adapter for laptop offers plug and play connectivity (no driver install required); Works with Windows versions 7 and up, Windows Server, macOS 10.14 and up, Linux distributions with kernel 4.11 and up (LTS only), and Chrome OS
TECHNICAL SPECS: USB 3.2 Gen 1 Type-A (5 Gbps); Compatible with USB 3.0/2.0; 1x RJ45; 9K Jumbo Frames; VLAN Tagging; Wake on LAN; Energy Efficient Ethernet (EEE); Supports twisted pair crossover & auto detection (Auto-MDIX); Color: Silver

$42^.99 –