"Olvid" app not updated anymore in Apps for 64 bits devices

Somebody wanted to know why the app "Olvid" available in the Apps installer was an old version. The last vesion available in the Play Store was the 0.8.3.

I looked in Apps with my Galaxy J5 2015 (32 bits) and it was indeed the 0.8.3 from August.

But when I looked with the Galaxy S7 and the Fairphone 3 (64 bits), it was the 0.8.1 version from April.

I suspect it to be an architecture issue.