You can just mount the ISO on the server and perform in-place upgrade, but please make sure you have taken backup of the vcenter server.
Any one here can respond please
thank you for replying, the ISO is 2.81GB for U3c vcenter, is that ok?
Yes its the "right" one.
Release Date: 2017-11-09
Build Number: 7040641
File size: 2.81 GB
Is there a reason why not 6.0u3h or maybe 6.5u2latest?` If your 3rd. Party Stuff (Backup and Monitoring!) support the higher vcenter version i suggest to upgrade to 6.5... and to upgrade to VCSA instead of vCenter on Windows. That doesnt mean that you have to upgrade your ESXi Hosts... they can stay on 6.0.latest if they dont support 6.5 and up.
vCenter for Windows is dead.
At this time we have some task due to which we only need to go to 6.0 u3, does not matter also c or h etc. once we are done with our project in couple of months we have plan to go for 6.5 on appliance and will discontinue our current windows based vcenter.
Prior to that we have HPE data protector upgrade also to support 6.5 vcenter.
appreciate for help