I'm a bit confused. DO you mean that the patch itself will not install properly, or that you're having difficulty actually downloading it onto your machine? I have to imagine the first one is really the problem.
More information is going to be needed to help fix your problem. For example:
What mods load order?
Do you use OBMM / Wrye Bash?
If you use Wrye Bash, have you built a bashed patch?
What are your machine specs?
The more information you give everyone, the easier it is to help you.