OpenVPN installer fails

I just tried to install the current .PAF. file and the install failed :-

"Unable to download file ......./binpack/current.txt (file not found 404)"

Other than this the install appears to work but when I try to run it I get the error :-

CreateProcess failed, exe='F:\PortableApps\OpenPNPortable\App\bin\openvpn.exe' cmdline='openvpn --version' dir='f:\PortableApps\OpenVPNPortable\App\bin'

I assume this is trying to install the 2.3.11 Win7 64 bit version.

This was all under XP. - However, I see the same install problem under Win7 Professional.

Under Win7 Professional I don't see the runtime error that I see under XP (so I assume it has installed the 64bit Win7 version) but it fails to start the GUI - even with a valid config.

Any ideas ??
TIA
Dave