This link will download a file whereby a download arrow is visible at the top of your screen. Go to downloads and click on eventcheckin.apk .
As a security precaution it isn't allowed to install applications who don't originate form the Play Store. A notification is given about this. Click on settings to modify this.
Check the checkbox unknown sources under device manager to allow the installations of apps from other sources. Click OK. After you are able to install the app.