This is the document that I also use to read daily.
You are correct in that the crash on your reader is due to the PDF is secured - secure from being modified. and you reader does not like the property
One way to do this is to install doPdf (free) , and print the document to generate another PDF, which will have no secure property so your reader can read. The downside is the newly generated PDF is flattened, so the table of context (TOC) is not usable in the reader, a pain for such big doc, although you can create your own bookmarks as you read.
Another way is to purchase pdfPasswordRemover software, which will unsecure the pdf and leave the TOC intact.
HTH
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