Auto update: Is this secure?

Question

Dot Net Auto Update

I felt like .net was lacking a simple secure automatic update library so I\'ve implemented something and put it up here. Before anyone considers

Answer 1

Just as an addition, add a MD5 CheckSum to the downloaded file as well, otherwise, looking good :) - Fair comment below.

Added:

The only additional thing I can see here is delving into things like obfuscating the code, or archiving the setup file and locking the archive, then once downloaded, unlocking it. That type of thing. However I think what you have currently done should be 100%.

The only time more is needed is when the application is very security complex. Right now you prevent DLL tampering and proof of origin, which for an auto updater, should be plenty.