starter to business upgrade issue's

-- HikaShop version -- : 2.3.2
-- Browser(s) name and version -- : Firefox
-- Error-message(debug-mod must be tuned on) -- : "Error
There was an error uploading this file to the server."

I just purchased the hikashop business edition and am attempting to upgrade my starter edition. I have downloaded both the .zip and .tar.gz (for troubleshooting) and when I attempt to install either using the joomla extension installer by uploading either file I receive the message:

"Error
There was an error uploading this file to the server."

I don't believe there is any type of permission issue (though it may be possible) since I have been able to actually upload and install other extensions using the same method.

Any help on pointing me in the direction I need to go to find out why the upgrade isn't installing correctly?

(note: the starter edition is working fine and has been for some time now. ive been very happy with the product)

Further testing...

When I manually upload the files and tell the joomla site to install using a directory I receive the following errors:

Warning
JInstaller: :Install: Cannot find XML setup file

Error
Path does not have a valid package.

Ok, managed to get it installed using the ftp method listed in the documentation.
Could some one on the hikashop team please fix the actual installation so that you can simply upload the .tar.gz or .zip file and have the installation occur successfully?

Thanks.