I heard Win 7 32 bit works for 4.0 but according to this doc Win 7 is not supported.
From release 4.0 - LAN CTE Configuration Guide
LAN CTE supports client computers with these operating systems:
• Windows 2000
• Windows XP
From release 6 LAN CTE Task Based Guide:
If you are using TAPI applications then TAPI 2.1 or higher is required. This is standard with Windows XP Professional SP3, Vista Business, Ultimate, Enterprise SP2 32/64.
Note: TAPI Option is not supported on Windows Vista 64-bit.
Supported Operating Systems
LAN CTE is supported on the following Operating Systems:
Windows XP Professional SP3
Windows Vista Business, Ultimate, Enterprise SP2 32/64 bit
Windows 7 Professional, Ultimate, Enterprise 32/64 bit
Windows Server 2003 Standard and Enterprise SP2
Windows Server 2008 Standard and Enterprise SP2
Windows Server 2008 R2 Enterprise 64 bit
Windows Small Business Server R2
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