Old app for V.4 camera

At this point, your option is probably to download a v2.50x version from an unofficial distribution source like APKMirror or APKPure. I would guess that your phone is running a 32-bit version of Android and that’s why you can’t install it from Google Play Store. Since v3x, the Wyze app for Android has required a 64-bit OS. This might be the relevant Forum topic that goes into the most detail about that:

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