1. Before NTM installation, remove installed versions of SQL CE 3.5 (SP1/SP2).
2. Download and install the x86 version of SQL Server Compact.
3. After the x86 version has been installed, download and install the x64 version of SQL Server Compact.
4. NTM installation process is completed.
Note: Please see the following supporting links related to the issue:
Applies to: NTM