Yes. .NET versions 4.x (4.0, 4.5, 4.6, 4.7, 4.8) operate side-by-side but are also in-place updates. Specifically, installing 4.8 replaces 4.0 because they share the same CLR version range. If you need 4.0 explicitly, do not install 4.5 or higher on that machine.
. This same CLR version is used for later updates like .NET 4.5 and 4.6. Why the Offline Installer is "Better" No Internet Required
If a newer version of .NET Framework (like 4.5 or higher) is already integrated into the operating system, the 4.0 installer may throw an error stating that a newer version is already installed. Because .NET 4.x versions are highly backward-compatible, the existing newer framework will typically run your v4.0.30319 applications automatically without needing the older installer. 3. Corruption of the Windows Update Component If you need 4
You can download the file once on an internet-connected machine, transfer it to a USB flash drive, and install it on completely air-gapped or offline computers.
Once downloaded, place this file in a folder named NET4_Offline on your desktop or USB drive. Why the Offline Installer is "Better" No Internet
I can provide tailored steps to bypass installation blocks on modern systems. Share public link
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Alternatively, you can also download the .NET Framework 4.0 offline installer from the Microsoft Visual Studio website: