Re: upgrading question
First question - why would your host worry about the version (as long as it is greater than 1.3.5) ?
Second, there is upgrading information in your Docs directory and in the tutorials/FAQ section here and many, many posts about the procedure. Yes, there is more to do than the statement you posted.
Please do not PM for support issues: a private solution doesn't benefit the community.
Be careful with unsolicited advice via email or PM - Make sure the person you are talking to is a reliable source.