Didn't want to upgrade my Linux distro, but really wanted to try this software. After the update [primarily of the libc], Spriter ran as expected.
As far as "installing", download, move or copy the Spriter_free.tar.gz to where you'd like it installed and...
tar -zxvf Spriter_free.tar.gz
Navigate to the directory that was decompressed and...
./Spriter
You'll have to manually add it to the Menu or link it, or whatever....