.NET 4.5.2 will not install on "RTM" (original) Windows 7. You must have SP1 installed.
Using the is the most reliable way to handle this, especially if you have a spotty internet connection or need to deploy the framework across multiple machines without downloading it every time. Why the Offline Installer? net framework 4.5 2 offline installer for windows 7
Once downloaded, you can put it on a USB drive and install it on any Windows 7 machine. Why the Offline Installer
Even if not prompted, a reboot is highly recommended to ensure the new libraries are correctly registered. Troubleshooting Common Issues Why the Offline Installer? Once downloaded
This usually means you accidentally used the web installer instead of the offline version. Re-download the full 66MB+ file.
While .NET 4.5.2 is robust, keep in mind that Microsoft ended technical support for this specific version in 2022 (except for certain OS integrations). For the best security on Windows 7, consider upgrading to if your hardware and software allow it.