Authorise Failed - Too Many Installs

Hi Folks,

Due to some issues with my install of Win7 x64 running under Parallels on Mac OSX, I have had to reinstall windows and PlusSpec a few times to get things running correctly, I am back up and running, but now PlusSpec is refusing to authorise due to me exceeding the number of installs.

How do I reset this so I may get back up and running. The installs are all done on the same MacBook Pro computer.

Many thanks,

Tony