Enable "Install from unknown sources" in your Android settings (Settings > Security > Unknown Sources). Note: This is safe only when installing directly from the developer.
Open the downloaded .apk file and install. Speedify MOD APK -Premium Unlocked- Download for Android
Yes. Speedify’s servers can detect client-side modifications. If detected, your account will be permanently banned, and you may lose any legitimate data you had. Enable "Install from unknown sources" in your Android