There may be times when an error similar to the following occurs:
A file that is required cannot be installed because the cabinet file c:\Users\<user>\AppData\Roaming\WhereScape Software Limited\WhereScape RED 6.8.4.00\install\disk1.cab has an invalid digital signature. This may indicate the cabinet file is corrupt.
This error is most likely related to outdated root certificates on the computer that WhereScape RED is being installed on. These root certificates are kept up to date by Windows Update. If Windows Update is disabled (as it often is on production servers) these certificates can get out of date and result in problems installing software.
The root certificates can be manually updated using the following link: http://download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/rootsupd.exe