Avoid third-party driver updater tools. The safest source is Realtek’s official site (though they prioritize OEMs). Alternatively, use a trusted repository like:
If you are trying to get this working on a Linux machine, you will likely run into issues out of the box. The 8188GU is a variant of the 8188EU family but with a different USB ID, which often confuses the kernel. realtek 8188gu wireless lan 80211n usb nic driver