Unable to install SP1 for SharePoint Designer "The expected version of the product was not found on the system"

I have downloaded SharePoint designer 2013 32-bit on my PC. My PC is is a windows-7 64-bit with MS office 32-bit.

now i download the SharePoint Designer from the following link :-

https://www.microsoft.com/en-us/download/details.aspx?id=35491

and i chose the 32-bit . then i install it and everything is working well.

but as mentioned on the above link that i need to install the SP1 for sharepoint designer (Please make sure your installation of SharePoint Designer is up to date by using Microsoft Update, or installing Service Pack 1 fromhere) . so i download the SP1 from the following link :-

https://support.microsoft.com/en-us/kb/2817441

and i chose the 32-bit. now when i tried to install the SP1 i got this error :-

so can anyone adivce on this please ?