the installation is complete but says itunes is still being updated

steve_solow wrote:

I just installed an iTunes update on my MacBook so I can back up my iPhone to iTunes. The installation is complete but I cannot open iTunes- says it's still being updated. Is there something else I need to do?

Reboot your computer and see if iTunes opens normally. If not reinstall.

tt2

For that I can understand that you are using Catalina or Big Sur and haven't found iTunes, right?

In those systems you don't have iTunes anymore. Finder is now responsible for that job

Use the Finder to share files between your Mac and your iPhone, iPad, iPod touch - Apple Support

Back up iPhone - Apple Support