update of your site should not be as hard as the initial installation, you should be able to perform this manually:

• backup your database and DNN installation folder
• rename your web.config to backup.config
• unzip upgrade package (w/o modules) or install package (with latest module upgrades) into the DNN installation folder root (where web.config and default.aspx reside)
• rename release.config to web.config (upgrade package only)
• open backup.config and web.config using a text editor - "Visual" Notepad is good enough for this ;)
• cut and paste the following strings from backup.config to web.config:
• both sql connection strings 
• both encryption keys
• down in sql dataprovider section ObjectQualifier and DatabaseOwner values
• save web.config
• hit your site to start upgrade process
• have fun!