Hi @Zeeshan.Butt 

Manual upgrades can be performed with a standard NOS binary. (For upgrades to version 5.5 and above, use PC-specific binary and metadata files)

1. Download the desired package from the following https://portal.nutanix.com/#/page/releases/prismDetails
2. SCP the package to tmp directory of the PC CVM 
3. Extract the tar file using

   tar -zxvf <filename>

    

4. Perform the upgrade by executing following command

   ./install/bin/cluster -i install -p -n upgrade

May I know the specific reason to upgrade the PC through CLI? Why not the onclick option from UI?