>https:// www.gpo.gov/fdsys/pkg/GPO-CHRG-GINSBURG/pdf/GPO-CHRG-GINSBURG-2-4-3-12.pdf
There are some .gov sites where you REQUIRE the https:// at the beginning of the URL. This means you need to copy the whole URL and remove the one space.
Also, sometimes when copying a URL you get a bit more. If you see %20Q at the end, remove it. Or even just %20.
The file does exist, the site works, but you need to double check the URL you copied.