For the benefit of anyone else coming across this (as well as yourselves of course):
There is an update available for anyone to use at
You need to install this (the installer will spot the old version and prompt you to agree to move the old files to a backup) then add the TeeChart\Delphi11\Lib folder to the library path.
Then, use the RBTeePackageBuilder.exe to do it’s magic, and viola! It works.