I've installed a new installation of DNN Platform Install zip file.  I've done this twice now.  When first browsing to the site, the install wizard works flawlessly.  When you click on 'View Website' a page comes up to auto upgrade to version 9.0.1.  When this finishes and you click on 'View Website' again and error comes up...

Server Error in '/' Application.

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The resource cannot be found.

Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable.  Please review the following URL and make sure that it is spelled correctly. 

Requested URL: /Install/UpgradeWizard.aspx

There is no UpgradeWizard.aspx or UpgradeWizard.cs anywhere in the install folder.  Is anyone else running 9.0 and how did you actually get it to install without an error?

I wish I had a screen shot of the upgrade.  It said at the top of the screen it was an upgrade from 9.0.0 to 9.0.1 and to put in the host user and password and an auto upgrade would try to run.  It kept failing with a security message until I uncommented the code access security level and made it full trust.

Now when I browse to http://innercitistorm.com  it redirects to an /install/upgradewizard.aspx page that does not exist anywhere. 

Thanks for your responses Sebastian! I appreciate it. It turns out the third installation try was the charm. I downloaded the installation files again, the file name was different, instead of DNN_Platform_Install.zip, it was named DNN_Platform_9.0.0.1002_Install.zip. Go figure!? It's working beautifully now. Thank you again.
Reginald Marable /MCSE