That file is part of a different package:
Code:
$ pkglocate standalone.cls
texlive_texmf-full-2016:print/texlive/texmf,-full:/usr/local/share/texmf-dist/tex/latex/standalone/standalone.cls
The texlive_texmf-full-2016 package for 6.2-release/amd64 is 568MB.