Hi there, hopefully this should answer/explain the problem you are having.
What the program does is uses a script on the iNetPrivacy network to check if a Proxy works or not. Without this check the program cannot tell if the Proxy is anonymous, or working.
It would appear that after the one and a half years you have been running the program iNetPrivacy has changed the program to use a diferent server to check the Proxies.
So if you purchased a copy of the program, you have to go through the process at
http://regdb.inetprivacy.com/regcenter.htm to upgrade your copy of their software. If you didnt purchase their software you cant really do much about this.
If after upgrading you still cannot run the program, then it would appear they have taken the server running the external script down and you cannot really do anything about this.
I hope that clarified the situation a little more for you. Please note I have no affiliation with that software in any way, so this is just an explanation from an informed perspective.