I have successfully updated VCF to version 4.5.0 this included upgrading SDDC manager, NSXT, vCenter and ESXi .
I am now upgrading the vRelaize LifeCycle manager to version 8.8.2 as per the BOM (The BOM for 4.5.0)
I am following these steps - Upgrade vRealize Suite Lifecycle Manager 8.x (vmware.com)
In the past I have upgraded vRealize Life Cycle Manager via SDDC manager but VRSLCM has now been decoupled from SDDC manager and you update using the VRSLCM UI - logon to vrslcm - select Settings and then Select System upgrade.
I have downloaded VMware-vLCM-Appliance-220.127.116.11-20080494-updaterepo.iso and attached it to the VRSLCM VM - I then select "Chek Upgrade" and I get the following message
"Some exception occurred while checking VCF supported versions for upgrade: Could not get VCF BOM details. Please check if SDDC Manager is up and running and VCF BOM is present inside vRSLCM."
SDDC is up and running everything is green -