Please separately specify if any changes have been made in plugin arrangement in this version after recent so many changes?
no user relevant changes to the plugins arrangement have been made, so if you are on 7.6.3, and you update to 7.6.4, you will not experience any changes regarding your existing plugins.
one thing you are going to like: 7.6.4 has the built in feature to open your specific plugins folder directly in an explorer window.
so you will not have to remember any past or present plugins locations, regardless where and how notepad++ is installed.
(this feature applies to both installed and portable versions, both 32 and 64 bit)
ps: if any supportive relevant changes are made or omitted, they will be posted as additional supportive notes, shortly after a release.
Seems you have still not started beta release concept?
the “beta” testing, using e.g. the appveyor artifacts, is still available and has been available for a long time.
i have given you a basic, but maybe too extensively technical guide, on how to test any version before it’s public release, a few weeks/months ago.
as the guide was, retrospectively seen, too technical, i (we) will try to write a simpler guide, suitable for the general public, as soon as i (we) can find the time to do so.