The 2019-2020 Federal Student Aid Handbook with Active Index is presented as a single PDF file. The page numbers in the index are active links that will take you directly to the cited page in the PDF file. In the header, "DCL", "CFR", "Glossary", and "Acronyms" are active links that will take you directly to the corresponding Web page or document.
The index appears at the beginning of the document (replacing the table of contents), followed by the Application and Verification Guide, the numbered volumes, and the appendices of the Handbook.
Note that this is a very large file--16MB--so it might take some time to download.