There is no universal "FX File Explorer Plus license key" floating online. The app uses Google Play License Verification (LVL) and in-app purchase receipts. Mods disable this check, but they typically patch the app's code – which is easily detectable by antivirus and Google Play Protect.
While you won't go to jail for downloading a mod APK, you are violating the Digital Millennium Copyright Act (DMCA). Furthermore, Google Play Protect is now incredibly aggressive. If you install a mod APK, Google Play will: fx file explorer plus license key mod apk high quality
Unlike many modern apps, the Plus license is usually a one-time fee rather than a subscription. There is no universal "FX File Explorer Plus