If you have an active S-User ID, you can download it directly from the SAP Software Downloads section. Search for "Crystal Reports XI R2" under the "Archives" or "Support Packages and Patches" tab.
Crystal Reports XI Release 2 (R2) Service Pack 6 (SP6) was a critical update released by SAP (formerly Business Objects) to provide compatibility with Windows 7 and various bug fixes Crystal Reports Xi R2 Sp6 Download