If the direct download link doesn't work, try the Google Drive link below:
To download using the above Google Drive link:
Click on the link. This should open a preview of the PDF.
Click on the 3 vertical dots at the top right of the screen (see picture below). This should open a small menu.
Click "Download" (see picture below).
If reading offline, downloading the PDF is recommended (instead of reading from the Google Drive) so that all the links will work properly.