Hello there,
I want to clarify a question, I currently have a license for an ESXi 7.0 host.
However there is an environment where we want to install ESXi 6.5. Does the ESXi 7.0 license work for ESXi 6.5?
or should I purchase a new 6.5 license?
The licence yes, the key no.
Downgrade one of your licenses to get access to a 6.5 key: https://kb.vmware.com/s/article/81665#Downgrade
