This is rare, but can sometimes happen when the ALM platform loader does not get updated correctly, since the older version of the platform loader still points to the old QC 10 install directory this is where the files get downloaded to, so when the application loads it looks in the new directory, but since the platform loader put the files in the wrong directory it is unable to find the files.
**The best way to keep this from happening is to select to set the temporary internet files to ''Check for newer versions of stored pages'' ''Every time I visit the Webpage'' this way the ALM platform loader and associated files are updated when you access the page and the client files will get installed to the correct directory.**
To set this setting open IE then open internet options, under the general tab click settings under Browsing History and open the Temporary Internet Files tab.
It is also a good idea to clear the temporary internet files once in a while, if you still have problems after changing the above setting, you can click ''View Objects'' and ''View Files'' under the temporary internet files tab and delete the ALM/QC platform loader and spider files from the `C:WindowsDownloaded Program Files` directory and clear everything from `%userprofile%AppDataLocalMicrosoftWindowsTemporary Internet Files` .