i ran the update several times each time it just restarts and asks to update again

Hello, piyushspatel13.

Let's start off by checking the helpful steps in this article that was linked to your posting which can help with this issue: Update macOS on Mac - Apple Support. This article walks you through the steps to update your Mac operating system. If you run into issues while following those steps, these articles can help:

1. If your Mac starts up to an Apple logo or progress bar - Apple Support
2. If an error occurred while updating or installing macOS - Apple Support

Let us know if we can help with anything else at all or if this doesn't settle your issue so we can look into this further with you. Thanks and have a fabulous day!