First, you need to add to the e2 project an option to generate hex file as output - Do it under project->properties->C/C++ Build->Settings->Converter->Output, then when you build you will find the hex file under the HardwareDebug directory.
Download and install the latest Renesas Flash Programmer software (current version is V3.04.00)
here is the link - https://www.renesas.com/en-us/products/software-tools/tools/programmer/renesas-flash-programmer-programming-gui.html
Then, after installation, connect the kit to the PC USB and make sure SW1-1 is ON - Programmer/Debugger mode
Run the Flash Programmer tool and create a new project - File->Create New Project, select the MCU type and tool:
Then select the directory where the hex file is located:
Then, press "Start" and the programming process will start (Erase, Program & Verify)
At the end you should get an "OK" message:
Now, unplug the USB, set the SW1-1 to OFF - Standalone operation - and replug the USB, You should see the demo running.