Vista - System.Deployment.Application.InPlaceHostingManager.AssertApplicat

I'm using the class InPlaceHostingManager to programmatically run clickonce
applications. The following code works fine on Vista if I call the
AssertApplicationRequirements with a parameter of true. Without passing true
to the AssertApplicationRequirements method I get the error "User has refused
to grant required permissions to the application".


On XP (with System.Deployment.dll version:2.0.50727.1433) the method
AssertApplicationRequirements does not allow me to pass any parameters and I
get the same error "User has refused to grant required permissions to the
application". Is there a way to get this to work in XP? How do I get the
System.Deployment.dll with the new method installed on XP?

ApplicationTrust trust = new ApplicationTrust();
PermissionSet set = new PermissionSet(PermissionState.Unrestricted);
PolicyStatement ps = new PolicyStatement(set);
trust.DefaultGrantSet = ps;
trust.ApplicationIdentity = e.ApplicationIdentity;
trust.IsApplicationTrustedToRun = true;
ApplicationSecurityManager.UserApplicationTrusts.Add(trust);


iphm.AssertApplicationRequirements(true); ---- (true) not supported on XP