Has anyone downloaded this update? I’m afraid of updates because security

I assume that you are talking about iOS 16 and higher. I always update my devices because the updates address security issues. iOS 16.1.1 was released to specifically address security issues. You can read this for more information.

About iOS 16 Updates - Apple Support

This talks about the security updates.

Apple security updates - Apple Support

Security generally improves with each update, and there are security fixes in this one.

So yes, it is safe to upgrade.