Yes you can. Are you deleting the old database?
Yeah, but I've made a backup I do this based on various recommendations from people in this forum.
So you say I can do that (install, revert if necessary etc.) without problems. Can I also do it, without affection the ESX servers uptime? I can't afford to let them reboot or similar.
Your VC server installation shouldn't affect your ESX hosts uptime.
The only thing that I've been caught out on was having some guests set to
auto-start. When running a service mgmt-vmware restart on one host in order
to overcome some VC - ESX communication issues, I inadvertently re-booted
some of my guests. At the moment I've set auto-start off for all my guests
until my migration is complete.