If a website is asking you to pay for one or download an .exe file from a third party, that is likely malware.

simultaneously for a few seconds to re-sync the mouse to the dongle. Check Battery Polarity

If you want to remap those buttons to do something else (like play/pause music, copy/paste, or use them for gaming), you cannot do that with a "Miniso driver." Instead, use universal software:

Open your computer's Bluetooth settings and search for a device named "MINISO-M09" or similar to pair. Troubleshooting and Driver Updates