Just download 8 GB and you are set...

Hey, Xilinx. Thanks for giving out your FPGA development environment for free (as in beer) and all... but seriously WTF: Since I downloaded it the last time (about a year ago), the size of the download increased from 4GB to 8GB?! Moores law in full effect?

(note: I still have only 2MBit DSL around here)

Furthermore: They send you a (uncompressed) .tar, which includes xz-compressed .zip archives.

$ tar tf Xilinx_ISE_DS_14.2_P.28xd.3.0.tar
Xilinx_ISE_DS_14.2_P.28xd.3.0/
Xilinx_ISE_DS_14.2_P.28xd.3.0/idata/
Xilinx_ISE_DS_14.2_P.28xd.3.0/idata/ise_0090.zip.xz
Xilinx_ISE_DS_14.2_P.28xd.3.0/idata/dsp_tools_0006.zip.xz
(...)