The latest version of .NET Framework i.e version 4.0 can be downloaded from the below link.
Download .NET framework 4.0 Web Installer
The web installer is a exe file with 869 KB size. When you run the exe on your system, it will download the required files from Microsoft portal and install them on your package. if you need to install .NET on multiple computers, download a standalone installer. The web installer will download the same files on each computer you install it on.
You can download standalone installer from the below link.
The size of the installer is 48 MB.
If you want to install .NET on computers that are not connected to internet, then downloading a standalone installer is the right thing to do.
The above packages can be installed on below Windows versions.
- XP with latest service pack ie. XP SP3
- Server 2003 Service pack 2
- Vista SP1 /SP2
- Windows 7 RTM/SP1
- Windows Server 2008