At the server
Start > Devices and printers
Right click the printer and go to Printer Properties > Sharing > Additional Drivers
check the box for x64 > OK
Browse to the freshly downloaded x64 bit version of the driver and run through the wizard.
Go back to the client PC and connect to the shared printer. Make absolutely certain that the Query Printer option is not selected on any screen it shows up on or you will end up with a Class driver that wont work
But before doing anything, go to Print Server Properties and remove all drivers for the machine that are not the x86 in use