I am trying to install the 3cx phonesystem v11 on a windows server 2008 R2 and I keep getting the following error: Product: 3CX PhoneSystem -- Error 1330. A file that is required cannot be installed because the cabinet file C:\Users\Administrator\AppData\Roaming\Install\MainFeature.cab has an invalid digital signature. This may indicate that the cabinet file is corrupt. Error 272 was returned by WinVerifyTrust. Has anyone encountered this? Ideas on solving it?