: Download the Microsoft .NET Framework 4.7.2 Offline Installer instead of the web installer to avoid network-related certificate issues during the process.

Double-click the downloaded .crt file. Install Certificate:

Imagine this: You’ve just finished a flawless legacy application. It targets .NET Framework 4.7.2, runs like a dream on your modern Windows 10 test rig, and is ready for deployment. You ship it to a client’s factory floor, where a perfectly stable Windows 7 machine controls a $200,000 piece of machinery. You hit "Run."

After completing the above steps, retry installing .NET Framework 4.7.2:

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