Uploading HP DesignJet 500 drivers causes the "Check that the Driver Store (idsd) is loaded" error similar to TID 7008052.

I have tried importing from the downloaded drivers and also importing from system after installing them locally.
The WinXP version works, but I am now trying to do the Win 7 x64 ones. All other printers uploaded without issue.

I tried using iprntcmd -U on the client as suggested in the TID but it errors creating the ZIP file (or so it claims).
I also copied the drivers to the appliance then tried running iprntman but it does not have an option to do this via the INF file (the error says this option exists but the documentation says only ZIP or PPD).

The drivers do not have a PPD file.

Ideas on working around this ????