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This download is from Microsoft and therefore would relate to the WinPE version, not the Reflect build version. In terms of why it's not working, is there any third-party anti-virus solutions running on your system? There are other threads here where they have been found to interfere with these downloads and sometimes the build process, since some files are applications that do things that can be used for malicious purposes, such as modifying a partition's boot sector. Is there any more information shown if you click that View Log button in your screenshot? Another option would be to download the WinPE components as a zip file using the Macrium Download Agent. If that zip file is located in the same folder as the Reflect installer when the latter runs, then the WinPE components will automatically be added that way. However, some anti-virus solutions have interfered even with downloading that zip file.
On an unrelated note, if you want "Automatically unlock encrypted drives" enabled, you should also check the BitLocker option above to ensure that the necessary components to work with BitLocker are included in the Rescue Media build.