Upgrade Win2003 Client 6.5 to 7.5

Dear Experts

One of the  Win 2003 R2  x86 client is on 6.5 version , I am looking to upgrade to 7.5.0.7.

I belive I first need to upgrade to base 7.5 then 7.5.0.7

Can someone please share the link from where I can download Win Client x86 7.5 Version  please.

I have 7.5.0.7 patch already downloaded.

It is bit urgent, would really appreciate for the help  as always.

Thanks!