Spine for Linux comes as a tar.gz, which is a compressed file format and container. You can usually uncompress that in the file browser (assuming you are using Ubuntu) by double clicking the file. Or you can uncompress it on the command line/terminal via the command tar xzf Spine-64bit.tar.gz.
Once you've unpacked the tar.gz file, you'll find a file called Spine.sh. This is a shell script that you can run to start Spine. Again, Ubuntu should allow you to double click this in the file browser to launch spine, otherwise you can run it on the command line via ./Spine.sh.
