Until Pokemon Go makes it way to countries outside of Australia, New Zealand, and the US, a vast majority of eager fans have little choice but to resort to obtaining the game through unofficial means, which means downloading the APK file. It's something we've outlined in this handy guide for Android users.
In the event you've obtained Pokemon Go through other sites, there's a chance it might not be the right APK. According to security software company Proofpoint, a malicious version of the game has been uploaded to various APK download sites.