Linux
Make an installation directory (anywhere you like)
$ mkdir -p /home/user/FISPACT-II/v4.0
Locate the binary for your system from the FISPACT-II files
$ ls
bin getting_started index.html
manual.pdf nuclear_data system_tests.tar.bz2
$ ls bin/ubuntu/18.04/ifort18
compress_xs_endf extract_xs_endf fispact
compress_xs_endf-4.0.0 extract_xs_endf-4.0.0 fispact-4.0.0
Copy the binary to a directory of your choosing (recommend ifort)
$ cp bin/ubuntu/18.04/ifort18/* /home/user/FISPACT-II/v4.0/
Setup alias/environment variable for FISPACT-II
$ export FISPACT=/home/user/FISPACT-II/v4.0/fispact
Copy and extract nuclear data to installation directory
$ mkdir -p /home/user/FISPACT-II/nuclear_data
$ cp nuclear_data/*.tar.bz2 /home/user/FISPACT-II/nuclear_data
$ cd /home/user/FISPACT-II/nuclear_data
$ for file in *.tar.bz2; do tar xvjf $file; done
$ cd -
Setup alias/environment variable for nuclear data
$ export NUCLEAR_DATA=/home/user/FISPACT-II/v4.0/nuclear_data