We are getting an error msg when we try to upgrade to 07.03.02 (development site). This is what the Portals\_default\Logs\InstallerLog.resources message has in it:

08/23/2017 18:24:45 [INFO] DotNetNuke.Services.Upgrade.Upgrade Start UpdateChildPortalsDefaultPage
08/23/2017 18:24:45 [ERROR] DotNetNuke.Services.Upgrade.Upgrade Error: Access to the path 'E:\Inetpub\wwwroot\WebDirectory\ChildPortalName\Default.aspx' is denied. at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.File.InternalCopy(String sourceFileName, String destFileName, Boolean overwrite, Boolean checkHost)
at System.IO.File.Copy(String sourceFileName, String destFileName, Boolean overwrite)
at DotNetNuke.Services.Upgrade.Upgrade.UpdateChildPortalsDefaultPage()
at DotNetNuke.Services.Upgrade.Upgrade.UpgradeToVersion700()
at DotNetNuke.Services.Upgrade.Upgrade.UpgradeApplication(String providerPath, Version version, Boolean writeFeedback.

We have tried doing this 3 different times(restoring backups) and we are kind of stuck. Any guidance would be greatly appreciated.