I bought 10 additional nw6.5 'user' licenses to increase increase my
license count by 10 because users were not able to log in.

When I downloaded and installed the license file, it turned out to not be
a 10 user license. It showed up as an 'unlimited user server license'.

Does this mean that we no longer have to worry about license count limits,
especialy the 90-day occupation of an individual license? How does one
confirm that the unlimited server license actually installed (other than
waiting until additional people no longer can log in)?

How does one install the unlimited server license over the top of the
tiered license structure of nw6.5?