not quite understood where is the problem

@albatros99 

Please share screenshots to clarify your issue. Still trying to understand your problem.

by clicking on the button "update" on vcenter port 5480, nothing is done.

There is no screen to see if new updates are there for downloading/installing

aah ok. I got it now. 

Before it worked, correct? 

is it in your home lab or in PROD? 

Check if the gateway is correctly written. Check in vCenter - vCenter VM itself in the inventory - correct VLAN or network adapter is connected. 

One more came to my mind - what exactly do you expect to see - when your vCenter already has the latest vCenter build? 

Do you want to see there vCenter 8 version? 

It would not be unreasonable as the update to 8 is there before one update to U3k, however I assume that it is missing as the upgrade path from U3k to 8 maybe isn't fully tested yet.

after any days, i found the problem.

it is a problem with firefox on mac osx ventura 13.3.

With safari on mac, all buttons are active and bring the effect wanted. The same is on Windows11 with edge!

I don't want to install vcenter 8 over vcenter 7 before i had a new license for using the version 8. 

Thanks for help