error when installing and updating
 

Error Opening Database File: mscorlib
at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.Directory.InternalCreateDirectory(String fullPath, String path, DirectorySecurity dirSecurity)
at System.IO.Directory.CreateDirectory(String path, DirectorySecurity directorySecurity)
at EQ2MAPUpdater.MainWindow.DownloadUpdates()Access to the path 'C:\Program Files (x86)\EQ2MAP Updater\cache\' is denied. No idea what this means.

You need to open the updater with Run As Admin via right click, or altering the Shortcut settings.

Please check the Sticky topics in the EQ2map forum, as this is the top answered question.