Nuendo6_64bit.msi not found

Update from 6.0.4 to 6.0.5 does not work (Win PC). After updating the eLicencer the installation is stop with an error meesage telling that I should use a valid file “Nuendo6_64bit.msi”. In the extraction folder thzere are no *.msi but *.msp files. I ried to rename it manually, but it does not help.
Any ideas how I can update?
Stefan