The install script is preferable, however I sometimes also have some concerns about install scripts and preffer a single binary.
If you have dependency problems, try using the ldd command to the binary, and if you still don't know how to install which package and you don't want to use the isntall script, try looking at the script without downloading them in their description.
If you want to get the source code of RSAGEN, you can get it at the GitLab repository, it will also be available as a tar, zip, 7z and maybe in GNU Savannah at some point.