
If you were displaying reports within your ABL application using the Crystal ActiveX Viewer control then you would need to replace this code with code that references Crystal's. Of course, support for this will become sketchier as time goes by and operating systems change. If you are not displaying Crystal reports in your ABL application and only export or print them then you could theoretically continue to use the Crystal XI RDC runtime (which would normally be installed separately).

If you are not integrating Crystal with your ABL application then there should no barrier to upgrading to CR2013 (but it sounds like this is not the case).

As Garry mentioned, the COM-based RDC was removed from Crystal Reports 2008 onward and there is no direct replacement so it comes down to how you were using Crystal Reports.
