You can either install it from your real hw device and, once connected via usb, do a $ adb pull test.apk or you can download it from these sites:

(I've tried them both for different RE purposes and they also have the latest updates for a lot of apps) APKCombo [1] & APKPure [2].

[1] : https://apkcombo.com/

[2] : https://apkpure.com