How do I update Switches in HA?

Where can I see the firmware version in HA, and how do I update them OTA?

You can’t see it from HA from what I understand.
Firmware Updating Instructions. If you are using the same USB stick you use on you home assistant instance, skip steps “Click “Remove” to remove the Inovelli device…” through “Click on the “Home” icon to return to the main screen.” two steps later. Not needed because the switch is already bound to your USB dongle.

I don’t have Windows, is that the only way to update it?

Same here. Any Mac or Linux support?

Third. Any way to update without a Windows?

I’d recommend a Windows VM if you don’t have a PC. Licenses are pretty cheap nowadays.