When tying UDP payloads to tryno, we were exceeding the maxtries in order to send all available payloads, leading to assertion failures. Currently there are not more than 4 payloads for any given port; most have none, many have 1, very few have more. So we will send them all at the same time with the same source port/tryno.
Nmap

Nmap is released under a custom license, which is based on (but not compatible with) GPLv2. The Nmap license allows free usage by end users, and we also offer a commercial license for companies that wish to redistribute Nmap technology with their products. See Nmap Copyright and Licensing for full details.
The latest version of this software as well as binary installers for Windows, macOS, and Linux (RPM) are available from Nmap.org
Full documentation is also available on the Nmap.org website.
Questions and suggestions may be sent to the Nmap-dev mailing list.
Installing
Ideally, you should be able to just type:
./configure
make
make install
For far more in-depth compilation, installation, and removal notes, read the Nmap Install Guide on Nmap.org.
Using Nmap
Nmap has a lot of features, but getting started is as easy as running nmap scanme.nmap.org. Running nmap without any parameters will give a helpful
list of the most common options, which are discussed in depth in the man
page. Users who prefer a graphical interface
can use the included Zenmap front-end.
Contributing
Information about filing bug reports and contributing to the Nmap project can be found in the HACKING and CONTRIBUTING.md files.