https://community.intel.com/t5/Software-Archive/Installation-problem/m-p/965863#M22844 Because the CurrentVersion registry key says 6.0. I'm not sure why that should be - try reinstalling the 6.5 upgrade (which I assume you used to get to 6.5) and try again. If that doesn't work, follow the troubleshooting tips the upgrade displays.<BR /><BR />Steve Wed, 05 Sep 2001 09:36:22 GMT Steven_L_Intel1 2001-09-05T09:36:22Z https://community.intel.com/t5/Software-Archive/Installation-problem/m-p/965862#M22843 When I tried to use the 6.6 patch, I get the following error message <BR />cannot be installed on visual fortran 6.0 <BR /> <BR />When I load Fortran, it shows 6.5. Also About shows 6.5. But then why do I get the above message. <BR /> <BR />Any idea? <BR /> <BR />Thanks <BR /> <BR />Venkat Wed, 05 Sep 2001 06:03:02 GMT https://community.intel.com/t5/Software-Archive/Installation-problem/m-p/965862#M22843 Intel_C_Intel 2001-09-05T06:03:02Z https://community.intel.com/t5/Software-Archive/Installation-problem/m-p/965863#M22844 Because the CurrentVersion registry key says 6.0. I'm not sure why that should be - try reinstalling the 6.5 upgrade (which I assume you used to get to 6.5) and try again. If that doesn't work, follow the troubleshooting tips the upgrade displays.<BR /><BR />Steve Wed, 05 Sep 2001 09:36:22 GMT https://community.intel.com/t5/Software-Archive/Installation-problem/m-p/965863#M22844 Steven_L_Intel1 2001-09-05T09:36:22Z