No. Newer .NET Framework versions (4.7, 4.8) replace 4.6.2. You do not need to install 4.6.2 if you already have 4.7 or later. The installer will exit gracefully.
It upgrades existing .NET Framework 4, 4.5, 4.5.1, 4.5.2, 4.6, and 4.6.1 installations. download .net framework 4.6.2 offline installer
✅ For normal installation on a PC, download the offline installer. No. Newer .NET Framework versions (4.7