My phone is almost 5 year old… 
I assume you’ve tried the version on google play ?
That is an outdated version anyway.
But should work on Android 7 and up.
Better to download an official version from here:
Or you can try an older version which you can find here:
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When you download the latest APK from @Karl_Schoelpple link and it tells you it was made for an older version of Android, there should be a button that lets you install anyway.