During installation I got a message that Clooz 2.0 optionally uses Microsoft Net framework. Not being a fan of MS I said no, the installation aborted. I tried again and against better judgement installed the MS program, installation went OK until an error message "Error1931, cannot update scrrun.dll as it is windows protected...." I said OK and the installation proceeded and was apparently was successful. It would seem MS framework is NOT optional, and updating scrrun.dll is not necessary.