simple upgrade or version check - no help!

I have been using P5 for a while. It runs on my macbook pro with vista 32
It is running very, very, slow
I wanted to check if there is an update for the program
It seems I cant get an update unless i buy support
I find this company nearly impossible to deal with when it comes to technical assistance
There is little to no support once an initial install period is over

Again ,I want some advice on how to ensure my install is up to date ,and I am not going to spend 30.00 to find that out.

Who can point me to a resource that indicates the current build and how to get it.

Peter