You can download the game safely and for free through the following official digital storefronts:
Always stick to the official stores mentioned above. Avoid third-party websites offering "Free Full Premium APKs" or "Cracked" versions; these are often bundled with malware and deprive the developers of the support needed to maintain the game.
For desktop players, a version is available on Steam. Note that unlike the mobile version, the PC "Full Edition" typically requires a one-time purchase but removes all microtransactions found in the mobile release.