The Client upgrade patches can be found here -
32bit - ftp://ftp.symantec.com/public/english_us_canada/products/symantec_endpoint_protection/11.0/updates/SEP32_645To754_clientMSPMSI.exe
64bit - ftp://ftp.symantec.com/public/english_us_canada/products/symantec_endpoint_protection/11.0/updates/SEP64_645To754_clientMSPMSI.exe