MCMS: Problem Installing MCMS SP1a, J# 3.0 is required!

Problem Installing MCMS SP1a, J# 3.0 is required!

There is no un/official semi-ignored release of J# 3.0 or J# 3.5; then why Microsoft Content Management Server SP1a Installation Wizard asks for it? Moreover, during Microsoft Content Management Server SP1a installation it does not install Site Manager; and if you go through custom installation, the Site Manager check box is disabled.

It appears that MCMS tries to find the J# for the most recent .NET framework you have installed. It actually looks for J# 3.0, or whatever latest version of the framework that is installed on the system.

So, there are three solutions that I was able to find:

1. Manual
- Uninstall your 3.0,
- Install MCMS, you will see the enabled check boxes for Site Manager
- And reinstall you latest .NET framework

2. Registry
- Open HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\ in regedit
- Rename v3.0 subkey(folder) to whatever(for instance 'zero')
- Install MCMS, you will see the enabled check boxes for Site Manager

3. Alternatively
- Install J# 2.0 SE from msdn site
- Create an empty file(VJSLIB.DLL) at the following location C:\WINDOWS\Microsoft.NET\Framework\v3.0\vjslib.dll
- Install MCMS, you will see the enabled check boxes for Site Manager