You should have Node.js and npm installed in your PC in order to install this app and run it.
Clone this repository by using git.
git clone https://github.com/biologyscience/overtone.git
OR
Check out the Releases and download the source code of the latest version.
Open up your terminal inside the project folder and do
npm install
This will install all the necessary dependencies to run the app.
Installing the dependencies can take upto 1 minute.
You would not have any .exe file to open/run the app. This is beacause, the app is not fully packaged yet.
So to run the app, open up your terminal and do
npm start
This will start the app by opening a new window.