If you are contemplating downloading the 3.5GB iso file for Fedora Scientific Live, then
be aware that after installing there currently are over 1400 updates to be performed.
These require downloading another 2.5GB's of files.
I suspect that the updating of Latex is a major contributor to the 2.5GB's involved.
FYI: After doing the updates...
$ latex -versionpdfTeX 3.1415926-2.6-1.40.14 (TeX Live 2014/dev)kpathsea version
Compiled with libpng 1.6.3; using libpng 1.6.6Compiled with zlib 1.2.8; using zlib
1.2.8Compiled with poppler version 0.24.3
Texmaker 4.1.1(compiled with Qt 4.8.5 and Poppler 0.24.3)