the easiest way to download it (from a person who owns a chromebook and has the mod) is to use the terminal (you should be able to find a more detailed explaination by googling how to download apks on chromebook). this is for linux though. hope this helps :))
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Um, that's probably not going to work sorry I'm not trying to be hypocritical but all of the videos about downloading Apks on Chromebook are mostly about Minecraft. and ADB (Andriod debugging bridge) is not the best option if you value your security it has weaknesses, flaws, or errors and it can potentially compromise your data if you are not that careful but I don't have the authority to tell you what you can and can't download on your device that I do not own.