C++ COM\DCOM version management

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This is may be very old problem but i really fustrating with same due to some API issues.

I am using some Desktop application API who's version changes each and every month with new feature. Lets consider following scenario, A Company ABC LTD introduce one window application ABCPRO now when they introduce it they dont have com support that is in version 1.0.0.0 the ABCPRO dont have com API. Now company progress and introduce new version of ABCPRO 1.0.0.1 , even this version they dont have com support.After some beta releases of ABCPRO in 1.* they finally introduce com suport for ABCPRO in version 2.0.0.0.

now its pleasure for us to get ABCPRO API and do some functionality.things works great with version 2.0.0.0.

Now in version 2.0.0.1 they introduce one more feature say LMN and which userful to us.so we remove ABCPRO 2.0.0.0 and install ABCPRO 2.0.0.1.Things work great for all our 2.0.0.1 customers but it fails when our customer have ABCPRO 2.0.0.0 So my executable crash on machine where ABCPRO 2.0.0.0 is present because i develop executable using 2.0.0.1.

So how to come out of this problem of versioning because i known in feature there are lots of versions of ABCPRO are going to be introduced with the feature that we needed but what about all old versions?????

Following code may clear you.

int main()
{
   IABCPROAPI ABCPRO;
   VARIANT var;
   ABCPRO->GetNameOfServer(&Var);
   VARIANT LMNVar;
   ABCPRO->GetLMN(&LMNVar);             //This introduce in version 2.0.0.1
}