Environment
Client for Open Enterprise Server 2 SP4 (IR3)
Windows 7
Windows 2008 R2
Situation
You receive an “Unsupported Operating System†message when trying to run the Client for Open Enterprise Server SETUP.EXE on Windows 7 or Windows Server 2008 R2.
Client for Open Enterprise Server will fail to install on Window 7 and Windows Server 2008 R2 if Microsoft Security Update KB3033929 has not been applied.
Resolution
Enable Windows Update, or manually download and install the Microsoft KB3033929 update.
Cause
Client for Open Enterprise Sever 2 SP4 (IR3) and later releases are signed using a new Micro Focus SHA-2 certificate, due to Windows’ intentional deprecation of SHA-1 certificates for code signing purposes as described in KB3123479. On Windows 10, Windows 8.1, and Windows Server 2012 R2 the new SHA-2 certificate signature will be handled successfully without any caveats.
On Windows 7 and Windows Server 2008 R2, the Client for Open Enterprise Server releases that are signed with an SHA-2 certificate will fail to install if the Microsoft Security Update KB3033929 has not been installed. KB3033929 adds full SHA-2 certificate support for code signing on these platforms, and multiple aspects of any driver software signed with an SHA-2 certificate will fail without this update.
If Windows Update has been enabled any time since March 2015, the Windows 7 and Windows Server 2008 R2 platforms will have already downloaded and installed this update, and the Client for Open Enterprise Server will install successfully.
If instead you receive an “Unsupported Operating System†message when trying to run the Client for Open Enterprise Server SETUP.EXE on Windows 7 or Windows Server 2008 R2, check whether Windows Update is enabled, or manually download and install the Microsoft KB3033929 update.