Can I use internet without WiFi to update my software

depends on your device. If you can connect it to your router/modem with an ethernet cable, the answer is yes. If not, no.

need more info

We are very bad at guessing and, when we guess, you may get some very inappropriate advice.

What Apple device??? Most can access the internet.

What operating system version is it running?

Please see this excerpt from Apple's article, "How to Write a Good Question."