Umbraco upgrade to 2.1.6
I had to upgrade a 2.0 installation to 2.1.6 of Umbraco, but, I did it in a very dirty way, 'cause I didn't want to loose all my configuration in the web.config. I just replacing the directories and some entries in the web.config. After, I ran the website, and the wizard started by checking all permission, connections, and security (that was a must, great job!).
My problem was at one of the last steps, the reindexing, it was giving me a "umbraco.cms.helpers.url.FormatUrl(String url) in C:\data\umbraco\umbraco2.1\umbraco\cms\helpers\url.cs:22". I googled a little, and found out that no one had the problem, maybe just because it's a little community.
I solved my problem, and found out that it was my fault, I just added some keys to the web.config, and there was a configuration that I must change to true, because I used directories, and not urls (I think in the previous version, I was directories).
The key: <add key="umbracoUseDirectoryUrls" value="true"/>
-f.