Failed download

After demo, I wanted free emclient, but download aborted partway through. Now I 'm going round in circles, can’t sign up because I’m told I can only have one app, but can’t access app because it’s not there. Repair doesn’t work, because download was incomplete. I have an activation key!!
Help

Go to the eM Client website and download and install the application. https://www.emclient.com/download

Once the application is installed and started, you can enter your activation key in Menu > Help > License.