Because Microsoft no longer prominently links .NET 4.5 on its main download center (it has been superseded by 4.6, 4.7, and 4.8), you need the correct direct link. The official filename is:
: It avoids installation failures caused by unstable internet connections mid-download. microsoft net framework 4.5 offline installer
Keep a copy on your trusted USB drive, along with this guide, and you will never be left struggling with a broken dependency or a failed web download again. Because Microsoft no longer prominently links
: 850 MB to 4.5 GB depending on the specific update version. 64-bit (x64) : 2 GB to 4.5 GB. Installation Guide for the Offline Installer along with this guide