it comes up with error message.
What kind of error message?
I do not have the option to update with my computer
See the following Apple articles:
Update your iPhone, iPad, or iPod touch
Update your iPhone, iPad, or iPod touch - Apple Support (IN)
- scroll to Update your iPhone, iPad, or iPod touch wirelessly
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If your iPhone, iPad or iPod touch won’t update
If your iPhone, iPad, or iPod touch won't update - Apple Support
I do not have the option to update with my computer
If the above fails, ask a friend, acquaintance or family to use their computer, or at a public library.
Alternately, visit your local Apple Store or Apple Authorized Service Provider and they should be able to help you out.
You will first have to make an appointment due to the pandemic.
Call Apple in your region see: Contact Apple for support and service
Contact Apple for support and service - Apple Support