I have known .net4.0 app can also use .net2.0 gac.

It is ok: install Npgsql .net2.0/4.0 at once.
It is NG: install Npgsql .net2.0, then install Npgsql .net4.0 by maintenance mode. also vice versa.

Sample windows installer written by WiX Toolset:
NpgsqlSetup.wxs https://gist.github.com/kenjiuno/8039290

Windows installer prevents gac dll from removing.

H:\Dev\Npgsql_files>"C:\Program Files (x86)\Microsoft SDKs\Windows\v8.1A\bin\NETFX 4.5.1 Tools\gacutil.exe" /u Npgsql
Microsoft (R) .NET Global Assembly Cache Utility.  Version 4.0.30319.33440
Copyright (c) Microsoft Corporation.  All rights reserved.


Assembly: Npgsql, Version=2.1.0.0, Culture=neutral, PublicKeyToken=5d8b90d52f46fda7, processorArchitecture=MSIL
Unable to uninstall: assembly is required by one or more applications
Pending references:
              SCHEME: <WINDOWS_INSTALLER>  ID: <MSI>  DESCRIPTION : <Windows Installer>
Number of assemblies uninstalled = 0
Number of failures = 0

Compile:

candle NpgsqlSetup.wxs && light -ext WixUIExtension NpgsqlSetup.wixobj

To install:

msiexec /i NpgsqlSetup.msi

Preselection:

msiexec /i NpgsqlSetup.msi ADDLOCAL=Npgsql45

Uninstall it:

msiexec /passive /x "{772a9e26-9ab8-4011-bce6-d95b19d22b57}"

Screenshot:

sample_installer4

Installer for Npgsql (into the GAC) #128

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