- Is it possible to upgrade version 7.0 to 8.1 with already overused license, or we first need to delete overused VMs? Not an issue about upgrade even overused the license.
- Is it possible to enter new 8.1 key with overused license, or we first need to delete overused VMs? Yes. Possible Its not have any issue. but if you want to exclude vms manually in vROPs before enter new license you can do it. Refer KB for exclude the VMs manually in vRops.VMware Knowledge BaseNawals
If you know you don't have enough licenses, why not buy more?