These are generalized installation instructions for all Android devices.
First make sure that if you have a Channels DVR Beta currently installed that you uninstall it. Next make sure that you are allowed to install apps from 'Unknown Sources" by looking in:
Settings > Security & Restrictions > Unknown Sources on the TS4k, the location for that setting can vary by device. The setting may be grayed out until developer settings are enabled by clicking on the build version 7 times.
Now you'll need to download the .apk file, transfer to your device, and install it from a file manager, so if you don't already have a file explorer installed or a way to easily transfer files, now's the time to set that up. There's a bunch of different ways to do that, and everyone's preferred method differs. If I'm sending from my phone, I use AndSMB, I'm not sure if the TS4k supports Samba or not. I'm thinking the easiest method will be to use X-plore from the Play Store. So install X-plore on your TS4k, and turn on the wifi server, it'll instruct you how to connect to it. Once you have the .apk transferred over, simply click it in the X-plore file manager and it will prompt you to install.