Open the file. Android will ask to allow “Install unknown apps” for your browser/files app — enable it (Settings → Apps → Special access → Install unknown apps).
Verify the hash (optional but recommended): the APK’s SHA-256 must match the one above.
On a PC: sha256sum pyblock-1.1.9.apk.
Tap Install. Open PyBLØCK. Done — your node, your keys.
Updates are checked in-app. No store account, no tracking, no commission.