The primary advantage of the offline installer is . Web installers are often small stubs that download files on the fly; if the connection drops, the installation fails. The offline installer, though larger in file size (roughly 48 MB), ensures that once the file is downloaded once, it can be transferred via USB or local servers and installed with a 100% success rate regardless of internet status.
On that page, look for the file named: (Note: For exact 4.5 RTM, Microsoft later repurposed 4.5.2 as the recommended offline installer for 4.5 family. However, the genuine RTM 4.5 offline is less common because it was an OS component for Windows 8. For Windows 7, you likely want NDP45-KB2858725-x86-x64-AllOS-ENU.exe – check the file details.) microsoft net framework 4.5 offline installer
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