The link for the driver is
http://www.astronomy.hu/pulsar.htm you will found it at the bottom of the page or go through the new site using
http://www.astronomy.hu and select downloads.
You will need Pulsar firmware 2.66aR or higher for the driver to work correctly.
The zip file contains two files but you only need to run the pulsar-setup5010.exe file if you already have 5.0.7 then this will be overwritten when running the 5.0.10 driver you do not need to remove the previous driver.
The ASCOM driver gives you the ability to Stop and Start tracking and Park and UnPark the mount you can also use PemPro to directly upload your PEC data to the Pulsar (not Pulsar2). The setup file contains a readme.txt file. This will give you more information about the driver.
Feedback would be great due to the problem where the driver is saying that ASCOM version 5 is required yet it is already loaded.
Kind Regards
-Paul Kitching