To obtain the new BU Harvard style, you can either:
a) Re-install EndNote 20 from AppsAnywhere (applies to Windows machines, BU or personal, and will be available shortly - if your references still output with [online] please try re-installing at a later date as it may take a few days for the changes to happen)
b) Add the new style from the BU EndNote desktop help pages here: https://libguides.bournemouth.ac.uk/endnotedesktop/tips1 (applies to Windows machines, BU or personal and also Macs, BU or personal).
c) If you have a BU Mac and install EndNote from the BU software menu, we will shortly have EndNote 21 available with the new BU Harvard style included.