You've downloaded a wrong version. Download the android version and you will get an apk file.
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I have some issues as well. I've tried downloading the android APK but every time it's a corrupted or failed file download. I narrowed it down to some issues on my part, one being I have a Samsung that hasn't been updated in a year. It might also be that the package installment has more megabytes on android idk.
If you can aid me I would greatly appreciate it