You must have administrative credentials to run regedit.exe.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP
The installed versions are listed under the NDP subkey. The version number is stored in the Version entry. For the .NET Framework 4 the Version entry is under the Client or Full subkey (under NDP), or under both subkeys.
If the number reads less than 2.0, you will need to download an up to date version of the Microsoft .NET Framework.
The Microsoft .NET Framework is only required to use VectorCUT® but is not needed in order to use any of the CadworxLIVE® designing software.
If needed, download the Microsoft .NET Framework Version 4.5.2 installation file from the Microsoft Download Center
Windows 8 and Windows Server 2012 include the .NET Framework 4.5. Therefore, you don't have to install the software on those operating systems.