I am having trouble to install software update

IOS update or another update? What happens when you try? Error message(s)?

IOS update.

See the articles below.

Update your iOS device.        

Get help with over-the-air iOS updates          

Update – Can’t or can’t restore 

Have you tried using iTunes on a computer or Finder if running Catalina to do the update?

 Update software on iOS devices in iTunes on Mac

If you see an error when you update or restore your iPhone, iPad, or iPod      

Updating iOS: common issues and solutions

I was given a command from toontracks for ez drummer and I don't know how to get it to work in terminal. I copied and pasted the command but now I don't know what to do after this. I have been searching the web for hours to find out what to do and I am just fearful of doing the wrong thing. Can you help? Thank you.