There are websites which scrape the play store, and let you download apks without login. The problem is you cannot be sure that you get the same apk as you would get from play store. (But actually you cannot be sure about anything on play store as well: the developers build the apks and upload it, e.g. an attacker impersonating the developer can publish a fake apk to play store.)
With these things in mind, you can download apks from apkpure without login to anything: https://apkpure.com/magic-earth-navigation-maps/com.generalmagic.magicearth Afaik they never had an incident where their apk was different from the one on play, but you cannot be sure when they change their mind.