🚀 go-pugleaf

I am a registered user of C++ Builder 6 Pro and installed it in a directory
C:\BCB6\.....
All works fine. I installed service pack 1 and 2 successfully. However
service pack 4 keeps on comming
back with  the following message and then it bombs out of the upgrade
process - please help:

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Warning:

Setup is not able to determine the product edition that was installed. It
does not appear that the update you
are trying to apply matches the edition that is installed. Product editon
information in the registry or binary
files my also be corrupt. If you are sure that this update is correct for
the edition you have installed you may
need to re-install your product.

This installation is for upgrading:
Professional Edition
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Help me ObiWan, yer my only hope..........