VMware has pointed out that even if you don’t want to move to a newer version of vCenter, Adobe may have already effectively made the decision for you. The situation is the culmination of VMware’s long effort to develop a vSphere web client that doesn’t rely on Adobe Flash.
VMware started its move in 2016 when it announced that Flash’s reputation as a security cesspit meant it was moving the vSphere client to HTML 5. While VMware quickly produced working code it only reached feature parity between its Flash client and HTML 5 effort in May 2019 with vSphere 6.7 Update 1.
To read the entire article, please click on https://www.theregister.co.uk/2020/04/22/vmware_client_flash_upgrade_warning/