HI,

The reboot is required probably because .Net 3.5 SP-1 updates the CLR and other components.

As for asking if you to run/download the file. You are downloading a file from an internet location. As with any browser, it is not permitted to just download a file without asking the user. This would be a huge security hole if it were allowed. About the only way you could get around that is to deploy your application on a CD and include the entire .Net 3.5 Framework on the CD. I don't think even deploying it from your own server will avoid that query, but you can always try.