If the Public Domain Edition runs on your machine, the Complete Edition will also run. You can run some of the programs without installing Euphoria, but you really should run install.bat to organize the files into subdirectories and set yourself up properly. Some programs will not run until you have installed. You can charge whatever you like for it. It is not shareware in the usual sense.
People can use Euphoria for as long as they like without obligation.
We make money from those who start to seriously develop large applications, and want to get the latest release, with printed manual, and enhanced debug support for large programs. In no event shall Rapid Deployment Software be held liable for any damages arising from the use of or inability to use this product.