Do not download executables from random YouTube links. Stick to known repositories:

After downloading, run the setup and follow the prompts. You will need the activation key sent to your registered email or WhatsApp after purchasing a course. Android & iOS Mobile Apps:

You will see Vietnamese apps (Zing MP3, VnExpress, VinID) and global apps (Messenger, TikTok). Note: QIK does not have the full Google Play catalog. You should subsequently download the "Google Play Services" APK from QIK or a browser to unlock the full Android experience.