This installation package could not be opened. Verify that the package exists and that you can access it, or contact the applikcation vendor to verify that this is a valid Windows Installer package." How to fix this installation error?

Does anyone know, how to fix  ' This installation package could not be opened. Verify that the package exists and that you can access it, or contact the applikcation vendor to verify that this is a valid Windows Installer package." ?

At what point in the process are you getting this message? Have you tried downloading a fresh copy of the iTunes setup file from http://www.apple.com/itunes/download/ ?
For general advice see Troubleshooting issues with iTunes for Windows updates.
The steps in the second box are a guide to removing everything related to iTunes and then rebuilding it which is often a good starting point unless the symptoms indicate a more specific approach. Review the other boxes and the list of support documents further down page in case one of them applies.
Your library should be unaffected by these steps but there is backup and recovery advice elsewhere in the user tip.
tt2

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